I feel so guilty, am I being too hard on myself or am I really a bad person?

I am a 14 year old male.I always feel guilty about things. For eg., i once slightly tore a page of a book in a library, and i felt guilty for a very long time, and i once felt guilty over accidently hitting a car door with my car door and I kept thinking that maybe i did it on purpose. I have a twin sister who is the same age as me (14). One day, I got mad for some reason while we were playing a video game or something and we got in a fight, or tussle or whatever you want to call it(I started the fight) During the fight, i grabbed her crotch. Ever since, I feel disgusted with myself and very guilty about doing that, and i keep feeling the fear that I might have meant it ually. I really don't know if I was thinking something ual or not,and I am also scared that maybe I was thinking something ual and I don't want to admit it.I also remember thinking right after I did it that I might have been ually and i felt disgusted with myself. I don't remember if I really was ually or not, but I might have been. I just want to be normal and get rid of all this guilt. But the uncertainty is killing me. I feel this way about quite a few thing's before, but nothing quite as bad as this. i don't know what is wrong with me.I want to take responsibility for my actions, but I don't want to be some weirdo kid. Not knowing for sure what I was thinking is the worst part of it, at least if I could remember then I would know what I was thinking, but no matter how hard I try I can't remember with 100% certainty. I started feeling guilty like a minute after I did it, and I've felt this way off and on for about 6 months. I feel so disgusted with myself. I think molestation and are horrible thing's and I feel so terrible that I did something like that.I really feel so bad.I can't live a normal life like this. Also, I know I touched my sister's crotch on purpose, my whole fear is maybe I was thinking something ual before or while i was doing it.BTW, I have talked to my sister about most of my feelings about this, and she says that she doesn't think it was weird and she think's I should move on basically. But I still feel guilty that maybe I somehow hurt her deep down and she's just lying to make me feel better. I sometimes feel like I'm just as bad as a child molester or a rapist, and that im a horrible person.It's always the "maybe" that bug's me, I've always had trouble knowing anything for certain. Please no comments, i'm serious and I'm not spamming. this is like the 6th time I've had to post this due to account problems and bad answers and I had to edit it. I just want to be normal again. Please help. I am asking this because I want to know if I am really a horrible, perverted person, or am I just thinking I am. Please be honest, don't say stuff just to make me feel good or better.