I always cum really fast when I'm having sex. After I cum once I am able to last for a very long time. Is there a way to fix this? I just don't like cumming fast, it makes me feel bad.

Male, straight

Once again, another answer provided from the male perspective by Mathieu.

This can be a problem, trust me. First and foremost, friend, don’t feel bad; it happens to the best of us. Realistically, you may need to start having more sex. Through practice and patience, though mind you, you’ll be having fun, you’ll eventually start learning to control your release. Pace yourself during sex, she may want it hard and fast, but tease her slowly—acclimate yourself to the feel of her so you can better control your thrusts. The biggest lesson here is to start getting in touch with your kegel muscles, the same muscles that allow you to ejaculate hard and/or stop pissing mid-stream, are your kegel muscles. With proper toning and use you can even separate ejaculation from orgasm, which is FUCKING AWESOME (pun intended), by the way. So many men think that ejaculation and orgasm go hand in hand, but realistically when you separate the two, you’ll be able to have multiple orgasms before finishing off with an ejaculatory-orgasm. 

Pro-Tip: Start training yourself in this skill through masturbation, work your way to the edge of an orgasm then stop, remove your hands, and clench those muscles. Yes, you will ejaculate a little, but you will be able to start controlling your orgasms. 

In the meantime keep enjoying sex, pace yourself, and don’t apologize for ejaculating quickly. Besides, you have fingers and a tongue, have at her.