"Man up" just means "you're the wrong gender to be allowed feelings, shut up" which is literally always bad. ADVERTISEMENT#13 You can't love someone else if you don't love yourself first. Don't tell me I can't love them because I don't love me. You're an open book who is curious about your surroundings and also has no pre-conceived notions about the new things you'll encounter. I don't find that to be a very useful axiom to base such popular advice.