The first problem is that you made this topic. (It's good that you want to be a better person, though, this is not the way to do it.) You care way too much about what a bunch of angsty teenagers think of you. Just say exactly what you want to say for your own pleasure, do not try to appeal to anyone else, don't go out of your way to impress anybody here. Confidence is not knowing people will like you, confidence is knowing you will be okay if they don't.
The second problem is that you are 14 years old. There's only so much you can do, a 14 year old is still going to act like a 14 year old at the end of the day. You are going to mature so much in the next 4 years it'll blow your mind. Most you can do is wait.
Third problem is you're focused on the past. The past has passed. Absolutely stuff nill you can do about it. The best thing to do is learn from your mistakes, continue looking forward, and plan ahead.
Last piece of advice I can give you: be social, talk to people, have conversations and interact with people in the actual real world. This is the only way to build social skills. Being around people and having successful social interaction will help you not be an starfish, be confident, be mature, and just generally not be an autist.
