Penis points straight up when erect. Difficulty having sex

Hey hope everyone's doing great. I (24m) recently had sex for the very first time about a couple of weeks ago with my partner (24f). Now my penis has sort of an upwards curvature like it points straight up when erect and it's not flexible at all like if I try to bend it down it physically hurts. Me and my partner have been dating for about 2 months now and prior to this we did everything other than sex and it was great fun fantastic. She knew i was a virgin I'd told her before and a couple weeks back we tried having sex. Since it was my first time, I had some difficulty putting it in since my dick isn't flexible AT ALL. Like i had to physically hold my penis down a bit so that it went in because it just refused to go in. Well we did the deed and it was fun but i soon found out that penetrating in any other position other than missionary is just almost impossible for me and ever since then I've constantly been thinking about the fact that she might want to idk maybe try different positions n all that. I've told her about my penis flexibility issues and she says it's completely fine n normal and it's not a problem AT ALL. But uk u always think of yourself fucking someone on the table or standing up against the wall or good ol doggy but I'm physically almost incapable of doing that and that's a real sort of confidence burner for me. I guess I'm just asking too see if anyone else shares the same experience and how to sort of idk counter it or get over it or what not.