Am I valid for feeling this way?

I (25M) have been married to my wife for 2 years, together almost 4. After we got together everything was going great, relationship growing and intimacy was mind blowing. After we got married though, it just felt like the frequency started to drop. Intimacy happens but it’s like once and a great while but when it does happen, it feels like she’s just trying to please me then go to bed. I miss the old days. I’ve attempted to talk to her about it but it’s like she says things to make me excited or anticipate change but doesn’t happen. It’s hard to wrap my head around my feelings because I want to feel desired but lately it hasn’t felt like it and it feels like it’s messing with my head. I don’t know, I just had to get it off my chest…