Catholic: having before marriage?

I am having the same problem. I am a 14 year old girl who is Catholic, and today in religious education cl I was informed masturbation an before marriage are sins. I have actually thought of switching to another religion because of this. If I am in love with a guy (I'm obviously not just going to have with some random guy I just met), but if I am truly in love with someone, I am going to have with them. It seems as if the Bible permits its follwers from having any pleasure. I feel that as long as I am in love, it is okay. Now, to go around and sleep with different guys every nigth is a much different story. You are only young one time, so in all honesty, if I were you, I would have .