Cant cum when masturbating

Hello forum, I'm 18 years old and im having some sort of problem while masturbating.
I can get it up often enough a day and also long enough. Though i've never been able to come/ejeculate while masturbating.

I started doing something "that felt nice" when i was like 11-12 years old. I laid in bed, thought of someone sexy, while i had some sort of teddy between my legs. In this way i came for like 4 years straight, once a day before bedtime. I tried this again a month long, day by day , just to check: but im still able to come using the teddy.

I read on this forum you should wait cause your balls/dick might be "exhausted". So i waited for over 2 weeks not having an orgasm once. This doesnt help me come while masturbating to porn or pics. ;/
I sport 2 times a week, weigh 65kg *1,75m , close to 6pack, so im not over or underweight. I dont smoke and i eat healthy. I dont use medication or drugs at all. Never had any serious injuries, certainly not close to that area.

Should i see a doctor for help, or has someone any suggestions how i can actually come while masturbating to porn or pictures?
p.s. im a virgin still and have a girlfriend that will last longer than my ex since 1 week now. Will i have the same problem while having sex?

 

One thread is enough!!