My old friend group moved on without me

Title is pretty self explanatory. I had a friend group in primary school and we fell out but they all still keep in touch(they all went to university, I didn’t). I never made very close friends after. I have made acquaintances and causal connections but nothing substantial. It hurts so bad to see them all together as if I never existed. At each other’s weddings and dress fittings, going on vacations, even their families vacation together now and their children are friends. I don’t know why it still stings but it does. I feel like I’ll never have friends again.