<human>: Can you condense the text into a few key points?

Hey reddit! 

I was wondering if I could get some help on something. As the title says, I really like this guy that is in one of my classes. Not only are we in the same class, but he's also a crazy good rock climber, which is an activity I love (and am working on to become better). Besides that, I honestly don't know him very well, we've talked a couple of times and just seem to click if that makes sense. 

So I wanted to ask him if he would like to go rock climbing together and I was wondering how I would go about it? I'm also worried if he says no or has a significant other already – what would I say then? I'm a giant ball of nerves and any advice would help!
<bot>: I want to ask out this guy that is in my class and goes to the same climbing gym. How do I go about it and stop being so anxious/unsure?