<human>: Can you give me a shortened version of the text?

So I(18/m) have dated a girl (19) for 1.5 and while sexually we are quite compatible and are physically attracted to each other, when we kiss there's never been great mutual chemistry. This is odd to me because I can definitely tell that she's getting rev'd up from kissing and I'm not. It doesn't turn me off it just doesn't do much for me. If we proceed to other intimate activities we do just fine and I do derive pleasure.   

While we have been each others firsts for many things I have never kissed anyone else and she has. This doesn't bother me I was just curious if anyone else has experienced this and whether or not it was a problem, became a problem, or if a simple technique issue would help? Do I "need" to kiss someone else to know if its different with them or am I fine if I don't mind? I'm partially afraid one day I might mind and what that would mean for us
<bot>: I(18/m) have a girlfriend (19/f) and we are sexually compatible but when kissing I don't get much out of it other than causing her pleasure