Love oh Love.....

Relationship problems, I guess we've all heard of them before, and I've always hated to read that kinda stuff anywhere, because I simply never had a relationship (forever alone?). But now (surprise surprise) I have a girlfriend and have one of those nasty problems myself...

Thing is, she is a bit older than me and therefore has a bit more experience than me, and, sadly, I envy her for being more experienced than me and therefore feel like an Idiot.
So what should I do now? I obviously have a huge problem with just ignoring it, because if I could, I wouldnt ask you guys for help...
So should I just leave her and try to sow my wild oat? But I don't want that, I want to be with her and not someone else.

Do you have any recommendations for me?

Also, I feel like a god damn Idiot for finally having a girlfriend and then destroying it all again by being a f*cking A**hole :(