Having a hard time lasting very long in bed. What can I do to improve my time and not busting too quickly?
Foreplay. Lots and lots of foreplay. Make sure she has 2-3 orgasms before intercourse even begins. It's impossible to be disappointed with the sexual performance of a guy who has just given you multiple orgasms.
Learn how to breathe.
Look up tantric techniques.
Pull out and press down at your scrotum for a few seconds before continuing.