It's a complete mental block for me. Whenever I get intimate with a girl I freeze and think of how she'll be disappointed when she sees my penis (of below average length and girth). I made out a lot in my life but never had sex and am scared of things like her gossiping about my small dick to other girls or her having a worse experience because she's been with much bigger men. Any help on how to permanently stop worrying about it? Sometimes I don't care for a few days but after a while start worrying again and it's literally eating at me.