How to increase self esteem and self efficacy

I am a male (25) who was raped when I was 7 or 8 multiple times. I have been to counseling and am currently in counseling for sexual addiction and relationship issues. I was just wondering how other people have managed to increase their self esteem and self efficacy. Everytime I like a girl and I'm in those beginning stages of talking to them I always start getting upset that the girl likes every other guy but me. Or that why would she like me if so and so is in her life. I also have a stutter and that doesn't help my confidence. I never voice my concerns because it's unattractive and the girl will no longer like me. I understand I'm somewhat attractive and funny. I understand there are great things about me but I still can't seem to shake those feelings when I'm in those situations. Anyone have anything that helped them? Thanks for any help.