I am 16 and have an 11 inch penis, i am very selfconcious about it, any help?

i dont want any people saying 'you little lier' or anything like that. my penis is just over 11 inches erect and im really self concious about it. i have had sex a few times and they said it was either the best they have ever had or incredibly painful and uncomfortable. my current girlfriend wont let me go near her pussy because she is a virgin and wants me to pop her cherry, but is scared it will hurt. so please help me?