Hello,
You seem to be having premature ejaculation. Premature ejaculation is sometimes very frustrating for the patient. It is most often caused by anxiety and too much stimulation. Depending on when premature ejaculation has started, it can be primary or secondary. The treatment of premature ejaculation is having a psychological session with the couple, stop-start or squeeze-pause techniques, desensitizing creams and SRRI (selective serotonin reuptake inhibitors) in severe cases ; but they are available under prescription. I would suggest you to consult a venereal and sexual health expert and discuss this with him.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
for those three asterisks there, just imagine it says climax instead if you don't get it.