Focus on a crowd that does things. Nobody wants to be a babysitter for a man. Just hang out and do stuff, make stuff, go places. Don't just sit around, drink, and hookup with chicks. That's fiat friendships: short lived, high maintenance and its value decomposes.
Trust has two meanings. The older you get, you understand there is nobody you can trust with everything. Even your best friends should be trusted with limited things.