hi
After going through your query I can understand the stressful condition you are going through. Expecting that you have followed the 'start and stop' and other methods honestly, I need you please to elaborate the following -

- you didn't mention the time duration after which you can't resist ejaculation... what is this time duration ?
- When does ejaculation occur...just by seeing the opposite sex, or before inserting the penis, or just after insertion ?
- Has the problem aggravated from the moment you first came to know about it.
- what is your job / working schedule ?
However, with such presentations in my clinic, my prescription to an young patient like you is usually following -
- Don't worry be happy because often its an unstable psychology and not a physical problem.
- Avoid junk / fast food. Take healthy home made food
- do yoga regularly especially in morning hours.
- during your personal moments, focus more on enjoying the moment rather than focusing on your performance.
- following medicines are often helpful in such cases (depending upon the etiology)....
. Dhwajmangal vati
. Chaturanan vati
. Vajigati ghritam
. Sarswatarishta
Direct consultation with a qualified Ayurveda physician would be more fruitful.

Hope i have answered your query and it will be helpful.
Warm regards....
Dr. Ranjeet Sharma