Feeling anxious about what your friends think is a very normal part of being a teenager. Your brain is developing rapidly, and the parts responsible for social connection and self-awareness are highly active. Fitting in with your peers can feel like a matter of survival. This anxiety often stems from a fear of rejection or being seen as different.
Remember that true friends will accept you for who you are, and it's okay to not be liked by everyone. Focusing on your own values and what makes you feel good about yourself can help reduce this anxiety over time.