Non existent sex life?! Is it my fault?

I need some real advice from an unbiased side!

My boyfriend and I have been together a few months! He’s perfect in every way.. my family loves him and his family loves me.. we love each other and he said it first! I’m not affectionate at all but with him I’ve really softened up! We barely have sex like we can go two weeks and at that point it’s because we had a disagreement and I voiced that we aren’t having sex enough. He is healthy and super fit and works out 6 days a week. I am not the skinniest or most fit but I am healthy, I would consider myself a little thick. I have big boobs and booty. I am sick of voicing I want to have sex and feeling like I am a 16 year old horny person when I’m 25 & he’s 29. It’s totally normal to have sex a few times a week. He says let him do it on his own but on his own is very rare and it’s frustrating he says it’s nothing to do with me but honestly it feels like it when your man doesn’t want to have sex but ever so often. Has anyone dealt with this?! How did you manage?!

Please don’t tell me to rub one out etc it’s not that easy!