Bullying sucks but sadly, it happens in school. You said you finished school so that shouldn't be a problem for you anymore.
What does having a big head mean? Stop being so insecure about yourself, kids say all kind of stuff to each other but that doesn't mean it's true. Everyone is conscious about their looks to a degree but that doesn't mean they want to suicide.
You're just being ungrateful. From the tone of your post, i am going to assume you're also very young possibly a teenager and at that age, jealousy of others makes you feel very worthless. But you should go and look at the more unfortunate than you and see how they're dealing with it.
You should thank Allah for what He has bestowed you with lest He takes that away and then you will realize your ungratefulness. I used to gym and i loved it but back in 2015 i got in a fight and broke my wrist, for 2 years it didn't heal right and you have no idea how much that has made me think of how perfect i was but do you think 2 years ago i was acting grateful ? NO, not at all. I had complaints about little useless things even then.
Say, "It is He who has produced you and made for you hearing and vision and hearts; little are you grateful."
- Holy Quran Surah Al Mulk Ayat 23
Yes, life is very hard but we can't comprehend how the Ar Rehman is bestowing His mercy on us by not giving us what our hearts might desire. I am trying to get married and it seems so hard and it has been a hard few months but i know inshaAllah, this will pass and a few years after, i will look down upon this moment and realize how i was being prepared for something or saved from something bad by having me go through this.
Keep your belief in Allah especially when it becomes hard and don't use ungrateful language. In just a few years, you will see how stupid and ungrateful you were acting.
As for poverty, the solution is simple.
Ask Allah for forgiveness and make a ton of Istighfaar day and night.
And said, 'Ask forgiveness of your Lord. Indeed, He is ever a Perpetual Forgiver.
He will send [rain from] the sky upon you in [continuing] showers
And give you increase in wealth and children and provide for you gardens and provide for you rivers.
- Holy Quran Nooh 70:10-12
Give charity. A lot of it or as much as you can.
Allah (SWT) says (interpretation of the meaning):
Say, "Indeed, my Lord extends provision for whom He wills of His servants and restricts [it] for him. But whatever thing you spend [in His cause] - He will compensate it; and He is the best of providers."
- Holy Quran Saba’ 34:39
There are other ways namely Upholding ties of kinship, Being mindful of Allah and fearing Him (taqwa), Performing Hajj and ‘Umrah often, Dua (see this - scroll down -
https://islamqa.info/en/190097 )