(23m and 23f) After a few months in relationship she told me she doesn't feel much plasure in sex, instead she felt a lot of pain. Then we tried to go very slowly, but even on the first try it hurted her, today we have sex 1 time a month or 2, but she asks to go fast and finish quick. On the other hand, i pleasure her always i can by other means but penetration, but she doesnt like to give me bj because she says makes her jaw sore and even jerking hurts her arm. I am not even huge ( im 7.5 x 5.5 in). I swear i tried to be the most gentle possible, but it doesnt seem to work. What rarely seems to work is by clit estimulation, but it doesnt last much longer.

Today i dont know if its some runaround, she is my fist gf and my only sex experience, and we have been together for over 2 years. I dont wanna break up, but i also dont want to live like that for life

Have anyone experienced this, have some advice?

*im not a english speaker

Edit: when i say im not huge i am not saying im short or average, just saying that im not like 9in or idk 7in thick, i mean i think it should be viable

Thanks for all who answered. I will think more about it, but you made more confident to think more on myself.