What should I do?. I (25M) lost my virginity to my GF (25F) last night and it was really disappointing

This is really embarrassing. I'm a virgin again after last night because I want to pretend it never happened.<br><br>Long story short is that I (25M) lost my virginity to my GF (25F) who is 5 months pregnant with our child. We have been together for almost 5 years. I was never sexually attracted to anyone in high school. I was a huge nerd and never had the confidence to talk to girls in my school. I was always in this "friend zone" and never had a GF in high school. In college things changed for me. I gained confidence and started to build my own physique which helped me. I met my GF during my senior year of college and we've been dating ever since.<br><br>Before we got together I learned that she had a really active sex life. I knew she had several partners before me and was in a few open relationships. When I found out I made a bet that I would not have sex with her until she was pregnant with my child. The bet was totally on me and I never actually told her. I was a virgin at the time and was nervous to have sex with her. I was unfamiliar with condoms, I didn't know what position to do and was just overall nervous. We were intimate and did other things together but never actually had sex.<br><br>After college I moved back to my hometown in the Midwest while she moved back to her hometown which was in the northeast. We did the long distance thing for a few years and would fly up and down to visit each other almost every weekend. She got pregnant with our child last year and we decided to settle down in my hometown to be close to my family. We bought a house, I got a good paying job and we're due to have our baby next month.<br><br>Last night we had sex for the first time. I was really nervous and you'll see why. She went down on me and sucked my dick for almost 10 minutes and I gunmenized almost immediately. I felt bad but kinda orgasmed because I've been saving myself for 8 years. It felt good but it was embarrassing. She laughed and said it was okay and we moved on to actually having sex. We did the missionary and I couldn't get in. I kept trying to penetrate her but it hurt her and she was saying I was doing it wrong. I tried again and again and she was getting really frustrated. After several attempts I finally got in and it was sloppy. I kept slipping out and made a mess. I was in for less than a minute and came again. She laughed and said it was okay and we stopped.<br><br>We had a conversation and I guess I have a small dick. She said she's never seen one this small and was surprised. I'm gonna get vulnerable here and say that I'm only 4.5 inches. That's really small I know. I'm going to the gym to put on some weight but idk. Last night was a complete embarrassment for me.<br><br>I'm not mad at her or anything and I don't blame her for making fun of me. I just feel disappointed in myself. She wants to try again sometime and I said sure but idk. I don't think I'm good in bed and my lack of experience really showed. I'm just frustrated and disappointed. I feel like I've been ghosted and I don't know what to do. I feel like I should just leave her alone at this point.<br><br>&#x200B;