23 M having issues with normal sex
I have been in a relationship with my girl for around 2 years . We have been have sex every 2-3 weeks from last 6-7 months but here comes the issue. I dont enjoy myself while having normal sex. I prefer oral sex than normal sex. This is happening from past 1-2 months. After oral my girlfriend wants me to have normal sex but i just dont enjoy it and i feel forced. After doing it i feel disgusted and it hurts my penis a bit. I am not able to confess this to my girlfriend as i love her very much and our relationship (not sexual is very smooth). Its not that i dont like sex at all , i like the oral part. I pleasurise my girl and she does it too. We have tried all kinds of stuff orally ( boob , blow job , going down to her private area ) i enjoy this but after that comes the normal part which i dont feel good about it and want to avoid. I dont have courage to speak to her as she helps me all stuff and really cares about me and same i do too.
Any suggestion appreciated.