DOn't freak out, but a teeny bit of muscle tone is good, just having some muscle burns fat and keeps your metabolism up. I know that's prolly the last thing u wanna hear, but take it into consideration. A 5 pound weight every now and then can only help u and no, u can't bulk up too much from it, just keep the reps the same.
You don't need to lose weight anywhere, you need to work on your self-confidence and how you feel about yourself; the problem isn't physical, it's mental. Trust me girl, I've been there! I never thought that being 20 pounds heavier would make me happier, but it has! I don't know what to tell you other than to see a counsellor, there can be some good ones that do "pro-bono" work - that is, free of charge, they are normally volunteer services. Check at school in your counselling office and see if there is anything like that.
I don't know what a wenis is, but from what I can tell from reading your post you have some sort of self-image issues and need to speak to a professional about them who can help you sort them out one at a time - that worked for me! I know from experience that this is very common in girls your age.