All my friends are married, I’m not

Okay so I’m a bridesmaid which is great and all but I took a look around and realized all of my friends are married, engaged, or in serious relationships (live with their boyfriends) and I’m just .... here. How do I celebrate these engagements and the news of friends getting more serious with their boyfriends with out feeling a little envious and sad about myself.

I do have a boyfriend who’s always busy so I barely get to see him so our relationship is progressing much much slower than I would have expected.