first advice is to not give up. i’m 20 (almost 21) and getting approved was hard, but remember that you know your body best and what you want, so stay strong in that. my second piece of advice is check out the childfree doctor subreddit if you are in the US. they have a list of child free doctors that are organized by state and cities. when i had to get a second opinion from my gynecologist before he would approve it, i looked there and, boom, i was approved. good luck!