sex life with long term boyfriend

So me and my boyfriend have been together going on 10 months, and we only have sex once a week maybe once every 2 weeks, mostly cause he doesn't like it in a car and we both live with our parents until we both can get our life's on track and finish school/find a decent paying job. 
Well...long story short I love sex and hate going without it, and when we do have it he doesn't make sure I'm satisfied, it's always I give BJ(which I love), we do it, and it's over. I never get the chance to finish 
I suck at communication mostly cause we hardly ever have any problems and are happy together, so what is a easy way to tell him I want him to focus on me every now and then?