I dont feel pleasure when having ?

I'm 16, and have been ually active for a year now. (Don't give me lectures on about being young ETC). My boyfriend and i have had over forty times, and i was just curious.. why don't i feel pleasure? I mean, the first few seconds he slides it in is heaven, and no matter what position, how hard, how fast ETC, i don't find it overly pleasurable (i like masturbation more?!). Its not because he's too small in that dept. either, because he isn't. Please, has anyone ever experienced this or have any tips? (I do kegal exercises daily)