Hi Roar,
"Severity" is in the mind of the beholder. I had at least a pair of Ds by the time I was your age. The worst was jr high school. High school wasn't so great and in college I started dating the girl who founded the schools nudist club. Two years after college a car was driven through a red light and I had 3 back fractures from the side impact and damaged nerves. Breasts became as nothing even though DD by that time. I have had major health concerns since then which have left me in a position to spend $40,000 on cosmetic surgery of many kinds if I wanted to look like a scarred up mockery of a healthy body and lose even more nerve functions than I have already lost (70-90% in parts). I joined a nudist club and spend 2-3 months there each summer. I walk 3-5 miles a day and climb 1000-2000 vertical feet each way every day and am in the best health of my life, though very fragile and easily unbalanced. I got rid of body shame, generically, and that included the breasts. I have freedom to go to beaches and public swimming pools, gyms and water parks, garden or cut my lawn without a shirt and if some of the neighbors make a big deal of shutting their blinds and avoiding coming outside that is their problem, not mine. I have taken back my freedom from the body image enforcement bullies. I also have had quite a few guys with breasts take their shirts off on the golf course next to my house and wave when they go by or give a thumbs up. The number of male actors with breasts being shown on TV has gone up a lot in the past few years. With publicity things are changing. However, body shame in general seems to be worsening with a great deal of hostility towards real people with real bodies being seen. I made it to 189 pounds yesterday from 285 10 years ago, 85-90 pounds water and congestive heart failure. I've recovered from that and am off the medications. And my breasts are all the way down to D and nobody cares. I've got a good tan and more stretch marks than even I can believe.
The difference between 210 pounds last year and 190 this year is a lot of flirting from the ladies.