I take FOREVER to finish...

When my bf and I mess around, sex or just foreplay, it takes forever for me to finish vs when I masturbate. When I play with myself I can finish in a few minutes tops.

Like when my bf and I do things it feels good, it doesn't hurt or feel blah. I can get close but usually it's like 30 minutes or more before I actually finish. Is that normal or okay, are we doing things wrong?

Note: we were both virgins when we started stuff, he has more experience, in a sense, because he watched porn, sexted with his exes, and girls just told him stuff.