I Want to Be a Better Person

Mistakes... I've done a lot of things in my life that regret. And I still do them. I don't know why. I know it's wrong. And I know people say since i'm young (i'm only 16 btw) it's no big deal and we all make mistakes. But I honestly feel like I need to change. I just don't know. I wanna get help but I'm too afraid to ask. Cuz I'm terrified to tell anything about all the horrible things I do. I've tried before, and everyone always calls me an asshole or something horrible like that and then leaves. I already hate myself, and when people judge me and say things about me like that it only makes it that much worse. I really wanna be a better person, I just don't know how. And that probably sounds dumb cuz everyone tells me, "How do you not know how to change?" But it's really hard. Maybe it's just me. I don't know anymore. :/