I also have anxiety. I can give you some tips but you should try to reach out to a therepist.
1. Focuse on the good about you
2. Focuse on the good in your life
3. Positive Affirmation
4. Think about your future. This will be over soon and you have your whole life ahead of you.
Trust me it gets better. 3 years ago my anxiety was so bad, but now I have it under control.