GOOGLE SENSATE FOCUS. it trains your brain to focus on the feelings of arousal that you may not recognize. This way it won't get out of control and end things before you have time to enjoy it. Seriously, it's a brain training thing. Give it a try. Its actually kind of fun to back things up with your partner, slow them down a little.
i have this same problem i cant even last 30 seconds its embarrassing but i know i can last waaaaaay longer i just dont know why i ejaculate sooo quickly it is really akward for me and my girl when it happens what should i do even when i masturbate im ejaculating within a couple minutes
It sounds like maybe you're struggling with premature ejaculation. You start the sex, and before you know it, it's over.
If so, there ways to work on it. Sex therapists usually recommend something called "sensate focus" exercises. It may sound a little silly, but they involve backing up a bit and slowly working with your partner toward intercourse (for a few days you won't even be naked). Sounds crazy, but it works. Google "sensate focus," and try it out.
The current theory on premature ejaculation is that mens' bodies can sometimes confuse the arousal that they feel when they are anxious and uptight with sexual arousal. So the more you worry and try to stop it, the sooner it happens. Hang in there - you can fix this.
If you have trouble on your own, see a therapist, or better yet, a sex therapist - they know all about it.