Date: 2021-08-04 21:38
Plenty of top U.S. players have full, thick lips. I myself have extremely full lips and I'm a professional player. I can think of several high-profile famous players with full lips but don't want to name names on the Internets bc that conversation could turn weird pretty quick. Try looking at personnel photos on the websites of top U.S. orchestras and see for yourself.
I know it's a tempting conclusion to reach after seeing players like Francois Leleux and Albrecht Mayer with their invisilips, but keep in mind that thin lips is a distinctively continental-European look. Although they think they own music, the rest of us are good at it too, lol
Your concern about your endurance is valid, but you are asking to wrong question to resolve it. Maybe try looking at your embouchure? Could altering that in a constructive way give you more endurance?
Also, don't overlook practicing more as the obvious solution. If you stop playing when you get tired, so you only play 30 mins a day, you'll never get any stronger than that, regardless of having a teacher or not. Try playing in two or three sessions a day of 15-30 mins each. You should see yourself gain strength this way for sure. Even if you still stop when you get tired, you'll get tired farther and farther into your sessions.