Hi, learn to get comfortable being alone. You will make friends, you will get setbacks. It's life.
If you become comfortable with yourself, you will be more blissful with people too. I am also a bit not comfortable being alone in a restaurant but that is something we need to conquer.
Try to find what things you like to do alone. What makes you happy other than people?
I have compounds of loneliness times when I feel why there are not people around me. But I find things to be happy with myself too.
To enjoy own company, to let go of what people think are big paths towards reaching close to self. It will happen slowly.