Hi, i can understand the distress you are through. Your problem is suggestive of a condition called premature ejaculation. The threshold for ejaculation is low. Subsequently, the duration for ejaculation is short. It often leads to unsatisfactory intercourse. Stress and anxiety are two major risk factors for premature ejaculation. In many cases there may not be any specific cause seen. A detailed evaluation of the associated factors of masturbation habit, pornography use is required. Most importantly, it is completely curable. With suitable medications and instructions it can be completely cured.
Next Steps
I would suggest you to consult with a sexologist. For more information and specific suggestions regarding the management you can consult with me directly here on practo.