Need More Sex

Lexi
I'm 19 I lost my virginity to my amazing boyfriend a couple months ago.  The sex is good but not as good as I imagined. I have never had an orgasim. And I really want to experience once. We do a lot of fore play but the sex it self is really short 5-10 minutes before he cums. 
Now I'm extremely sexual and frisky, I want it all the time, probably because every time we engage in sex he just leaves me unsatisfied and wanting more. 
What should I do? What should I say to him ? Please help