I'm 24 (M). Me and my girlfriend decided to have sex after our 6 month relationship. I never had sex before, it was my first time. We only had sex 3-4 times only till today. But thing is I cummed during makeout and when we had penetration sex I couldn't last even 1 min and I cummed. I mean is something wrong with me or things will get better with more experience. Should I visit a doctor for this. I mean I have heard from my friends they can go on for 5 or 10-15 min. I'm really confused.