I didn't have a single friend for the first 15 years of my life, AMA
I'm 20yo now, and I'm doing better, not great tho.
I was raised to be polite. "speak only when spoken to" type of "polite". I always kept any conversation to minimum, answering with as few words as possible because I was taught it's the polite thing to do.
I didn't talk to anyone in kindergarten/school for longer than a minute, didn't have a single friend, didn't play with anyone when I was younger, and didn't participate in any activities involving my classmates.