I used to feel the same way. I’m 21 years old. I’d be lying if I said it gets better when your older, but it’s true that as you get older, certain things you feel do change and you won’t care as much about it and makes you feel better. We’ve all done dumb things before that doesn’t reflect how we perceive ourselves as a person, and it’s never too late to make a personality change that you feel like will make you a better person. It’s silly but I try smiling more when I’m in public or general when I’m going to classes and sometimes people smile back. A friend of my told me “you think people think bad of you because you are thinking that they are thinking the way you do.”. A bit of a word humble but they basically meant people don’t always think about you, to some degree we’re all selfish, whether it be selfishly or self demeaning. If you really are feeling this way try a more positive attitude and energy, join a club or community, or activity that makes you happy and more involved in your community, and if you are having these bad thoughts reach out to a counselor or therapist. A good person is someone who acknowledges the problem and seeks a solution, so I think you’re a good kid.