Why do I feel uncomfortable around guys?

Why do I feel uncomfortable around guys?

The simple reason is your bad experiences with some guys have made your mindset that everytime you meet someone they won't be able to understand you and when you meet them in actual you already tend to be carrying negative feeling that it won't work or they just can't understand you.

What does it mean when a man says he’s comfortable with you?

It means that you make them feel really good. "He loves being with you and feels most comfortable when you are together."

What does it mean when a man says you’re dangerous?

When used as a light compliment, it means that he finds you attractive enough that he knows you could move through his world like a wrecking ball if he let you into his life. He perceives the danger so is wisely going to skip letting you work your special kind of magic on him.