we can easily replace you with someone who is a better muslim and that wont harm us, that gives me a sense of insecurity in my faith
if I can easily be replaced , do I even have a chance of going to jannah . this thread these thoughts alone are forbidden but my mind is free and I am utterly concerned.
First of all, some of the verses revealed saying this in the Qur'an referred to the Meccans who were opposing the Holy Prophet (saw) and who thought they were themselves irreplaceable. Hence, Allah told them they were completely replaceable if they did not accept His Messenger (saw) and the Book revealed to him (saw).
Secondly, yes, we are all replaceable either way. Our times of death are already determined by Allah, so He knows what will happen to us in the future, whether we should be replaced by other people or not. The meaning is that if we do not adhere to the guidance Allah has given, and to be more specific, if we reject the Imams He has raised for the age we live in and do not follow him, then we will be going against Allah. Then Allah can easily make others follow that Imam and we are thus replaced by them.
I say this because every age has a Mujaddid, and these Mujaddids (learning from the examples of the past ones) where given revelations by Allah that they were chosen to guide people so that they can revive Islam when people corrupted it. Every age has had something specific to it which needed reformation. If the people of that age did not reform themselves, then they are replaceable. Allah has promised that He does not combine two punishments on the believers. If He punishes us in this world, then we are not punished again for that offence in the Hereafter, otherwise, if we are left in this life, then He decides to punish or forgive us for what we did here in this world.
Therefore, do not fret about this. As long as you do not plan against Allah and fear Him (as you do because of your fear of being replaced by others), then In sha 'Allah, Allah will make you one of those who are guided in His way, that group of people who will never be overcome by anyone else in this world until the Day of Judgment. That group always remain guided by Allah, and they are never replaced.
I did many horrible deeds
and plus .. does everybody go to to hell until they are cleansed from sins except for prohpets are sahaba ?
I can say the same for myself too. I'm no saint. But not everyone goes to Hell even if they are Muslims besides the Sahaba (ra) and the Prophets (as). The Ahadith from the Sahih tells us that the Prophets will intercede, the Angels will intercede and the righteous believers will intercede. The Holy Qur'an says that there will be a large group of followers who are in the highest places in Paradise, and there are many of them later on who are in the highest places in Paradise also. This means not only will the Sahaba (ra) get to intercede, but other believers as well. Again, that is according to the Holy Qur'an.
If you wish to understand with peace of mind, then read Surah Al-Waqiah, it describes the three groups that will be divided up on the Day of Judgment, two of them for Paradise, and other the wretched scum who go to Hell. As long as you yourself fear Allah's Fire and pray against it, you will be kept from it, by His Mercy. But just remember your deeds don't land you in Heaven, it is strictly Allah's Mercy on us that, if we receive it, will keep us from the Fire.