The simple answer is to just not bother trying. If it happens, great, but the simple reality is that 99.99% of the people one comes across will not be your friend or even make eye contact with you much less give you a simple "hello."
Just be your own friend. That's the only realistic advice anyone can give to someone in adulthood.
Just be your own friend. That's the only realistic advice anyone can give to someone in adulthood.