What? That's perfectly normal. First two times I had sex I was like, "THIS is what all the hoopla was about?!" Gf and I met at 17 and fucked like rabid wolverines. She had had the same experience! Two guys before me, meh.
Felt that way with my ex-wife. Woke one day, realized I was lonely as hell, with a wife and two kids! Thank god she left. Took the kids, had to fight like hell to get 'em back, but thank god she's gone. Proceeded to have many fine lovers over the next few years, landed my wife, could not be happier.