Sex life

I have question I really need help with. I've spoke to someone who's like more experienced than me in the bedroom and to know that I feel like I know nothing and I've been doing stuff for 2 years now. I struggle reaching orgasm anyway but I so want to get their and I'm so so close but me and My boyfriend have sex for 10 mins like its a big thing to reach half an hour. He comes that quickly! I don't know how to talk to him about it and I want to buy games together and that but he doesn't seem keen or take me seriously and I really want to. How on earth do I talk this out with him without offending someone who gets offended easily?