You seem to defining your relationship with Allah in accordance to how other people treat you. So if you had a "good" life with other people, and they treated you better, then you would be happy with God? Don't you think that you shouldn't be allowing your personal relationship be effected by anything and anyone??
Some points to go over;-
1. There is an issue of how people deal with mental illnesses in the west, it is from the devil whispers, not only do they tell people to be evil, but they tell people to feel sorry for themselves (even if they have a right to be), but then people end of wasting their lives and throwing away what they could have done.
2. Your parents and others, have have lived longer in this world then you you, do you think that you need to spend so much time trying to have the "perfect" relationship, or that your going to teach them about kindness, love and compassion with people who have already lived and been married and have children? You need to respect your parents and others, but that doesn't mean squandering your life by saying that so and so wasn't like this with you. Even the Prophet Joseph peace be upon him did not go around like after he got thrown in a well.
3. Allah guides people, so the fact that your seeking advice is showing you that Allah is helping you to make your life better. We are tested, so if you think that a good relationship with Allah will only mean that you have a "perfect" family life then you are wrong. This test isn't about God just taking away our problems, removing all the bad people from our lives.
4. What you should do is firstly worship Allah-as Allah will help you to be guided more, as he is already doing.
5. The next thing you should do is concentrate on your plans in life, you need to get a job, take a course, I don't know where you live, but you shouldn't have any objections, don't wait for someone to show you what you can do, go and find out via resources on internet. As you work and build something else with your life you need to take control of your life, and not define it by what other people give you or not. It may include getting married in the future-please do not make the same mistake as others who jump in to getting married and get married to someone that they don't like.
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Allah gave you life, and for you to say that its less valuable, that your willing to throw it all away, because others haven't made your life easy. Allah didn't just sort out all the problems WITHOUT even the Muslims at the time of the Prophet Muhammad peace be upon him opposing evil.
If you can't survive living, remember you will be alive forever in the next world, if you go to Hell, Allah will not "kill you off". Allah has never made a mistake of creating people, just because they committed evil, that doesn't mean that they are going to reverse what Allah is not going to undo what he has done. If you commit suicide no one will be able to help you.
God is pleased with people who strive, you have to be religious regardless if you were being beaten up everyday, as again cannot define your relationship by the sins of other people. Your not the first Muslim who has learnt how society prone their relatives are. Don't let that get you down. Nothing that you said, will you be able to repeat on the Day of Judgement-as all that you will be saying is that you shouldn't have let evil doers effected your relationship with Allah. Even the evil-doers who followed each other by bad deeds will be blaming them, saying I shouldn't have followed you.
Then choose, as this is your test. What is more dear to you?? That you have Allah, the All-Mighty, where all the angels bow down to him in worship, including Archangel Gabriel and Micheal. There is much to look forward to in the next world. There is a lot of issues where people think that if they are not happy all the time, or if they don't get their life, job they want that their life is a failure-well this isn't a life its a TEST. People on the Day of Judgement, it would seem to them that they haven't lived in this world for years but day. No need to stress about others, including your sister (when anyway you've stated she hasn't allowed others actions to make her angry at Allah). Why should Allah be blamed for the actions of evil doers?? When Allah is holding them account on the Day of Judgement for their actions, where he is blaming the evil for their actions. If Allah stopped people from being evil, then how can you prove to him that you will be good.
Make the right choice and do not let the actions of others dictate your own PERSONAL relationship (rather that you should remember that Allah has given your parents and others so much, and its strange that they wish to disrespect others) with Allah, show your STEADFASTNESS-as how can you prove to Allah that you are steadfast if you were living like a princess?? Do not let evil actions of yours or others dictate your decision making, as evil is nothing, Allah attaches no value, even people who were in lewd behaviour have repented and made it to a good place in the next world. There are already so many in their graves, who wish to return to this world to make amends with Allah. So if you commit suicide, remember that you will only wish to return to this world to make amends and that you wouldn't care of the mistakes of others.
Remember Allah and the Day of Judgement. Thank Allah that he has given you so much, instead of saying that he hasn't given you enough.
Praise be to Allah, Lord of the Worlds.