I feel I am good for noth. Me wrong.

In a small query you have expressed so much about yourself & your situation. It's devastating to watch parents fight & feel rejected by friends. Everything put together is making you devalue yourself. Let's go through further into things you have mentioned . Firstly you seem to be evaluating your behaviour as immature. This evaluation might have shaped because of the way others have been treating you so far. When you carry this sort of evaluation, it gets expressed in the way you say what you say. Your body language including gestures, postures, tone, tempo, confidence level etc. convey to others that you are not to be taken seriously. This is the prime reason behind others correcting you when you express your opinions. This is a negative loop you need to break. Whenever you want to break a loop, you are to observe the way loop currently is(observe the conversations you are involved with keenly & check your as well as other people's body language) to get an understanding & step out of the loop (stop giving your opinions till you feel adequately accepted). Others respect your opinions, only when you respect your opinions & are sure about them. Others accept you, only when you accept the way you are. Coming to your inner state. It's natural to be frustrated & irritated when you are raised by parents who do not respect each others opinion & fight constantly along with friends who do not respect your opinions. Amidst all this you have started to look down upon yourself. You have accumulated several fears & insecurities lowering the self-worth further. My dear, there are 2 aspects to our life. First one is the way situations treat us and second one is the way we build ourselves. I want you to take a call on which aspect you wish to enhance. I have encountered many who use the first aspect wisely to strengthen the second aspect. It's up to you what you choose. Feel free to approach a professional who is qualified & skilled to assist you in the whole process. Good Luck..!!