It's understandable to feel like you're letting people down or not meeting expectations, especially during the challenging teenage years. However, it's important to remember that nobody is perfect and everyone makes mistakes. The key is to learn from them and move forward.

Here are some thoughts that might help:

1. Be kinder to yourself. Everyone makes mistakes and has imperfections.

2. Set realistic expectations for yourself. You don't have to be perfect in everything.

3. Focus on your positive qualities and accomplishments, not just your flaws or failures.

4. Talk to someone you trust about how you're feeling - a parent, friend, teacher, or counselor.

5. Practice self-care and do things that make you feel good about yourself.

6. Remember that others probably feel similar pressures and doubts too.

7. Learn from any mistakes, but don't dwell on them. Forgive yourself and keep moving forward.

Try to treat yourself with the same compassion and understanding you would offer a close friend. You're doing the best you can, and that's enough.