Not "wet" enough

So my girlfriend told me she doesn't think I'm aroused enough when we have sex. I never thought this was an issue or had thought my body reacted different while having sex with her was different then anyone else (I thought it was better). She said previous girls she's been with have been much wetter then what I get. Could that mean something is wrong with me? She also says when I climax just doesn't feel me come. I've never thought it was really a problem before but I want to fix it.