is this normal?

Me and my boyfriend have been having sex for almost 2 years now. We do have sex pretty often and it’s always been amazing. I have had 2 Utis and 1 yeast infection in the past two years but nothing huge. Lately i have this terrible burning/stinging feeling during intercourse. We were each other’s first, so i know it can’t be STD’s. I also don’t think it is an infection because it only hurts during sex, or when i wipe and doesn’t feel like a UTI or a yeast infection. We tried lube today for the first time to see if it would help the stinging feeling. it definitely helped but i still had some discomfort. Does anybody have any idea what this could be?