I have a few acquaintances I really like. I know them because they're friends of my friends. We've had a few casual conversations, but for some reason, I'm hesitant to get closer to them. They're very nice people, and I really wish they could be my friends too, but for some reason I get really shy around them, even though we have met many times before. I feel like, because they are my friends’ friends, I need to make a better impression on them. Any tips on how to overcome this?