I'm 21 why am i having this problem already?

helloo. my boyfriend and i are both 21 years old we've been together since we were 11. I feel like i'm a 50 year old woman because my life with him is quite boring. We have the same routine every time we do it and we are on opposite schedules of when we like to do it. he's a morning person and i'm a night person. we're 21, i feel like we should be having hot pionate and it's just boring most of the time. i dont enjoy it and im not sure what to do. anyone go through this? if so what did you do?