I need advice

Brooke

So my boyfriend and I have been together for almost 2 years and we waited till about 1 year before we started to have sex because it was my first time and I wasn’t ready yet and he was ok with that and in the beginning it was amazing and everything was perfect but now it feels like he doesn’t last as long and it doesn’t feel the same as it used to it’s totally different from before and idk if it’s because I’m just different or somethings wrong with me and idk what to do I don’t want to tell him because I feel like he’s going to get upset and feel let down in some way any advice??