Just feeling lonely tbh

I guess it's just the hormones but I've just felt super alone lately, I literally have no friends anymore. My mom is pretty much my best friend and then I have my fiancé. He's always telling me to make friends but it's hard with social anxiety on top of the fact I'm 18... Everyone my age is going out to parties going to college or doing stuff I can't do (which I don't mind I could care less about partying) my point is, is that it's really hard to find decent friends who are around my age and in the same spot in life. Please don't take this wrong I love my little girl more than anything but I just need friends again does anyone else kind of understand?