"How can I not feel bad about celebrating alone?"

Gratitude.

If you can experience gratitude for all that you do have and all you have done, then you won't feel bad about celebrating alone.

That being said, sometimes feeling bad is there to help us change. For example, when you feel bad about doing something wrong, you can use that bad feeling to help change your behavior.

Before I write anything else, here is an important question for you: do you want to have friends and a boyfriend or do you prefer to remain alone?

Cal