I really like this girl but I know she'll never be interested in me. It's making the thought of dating anyone else too hard to deal with
Why do you think she will never be interested in you?
Hah, that's an easy one. I'm overweight and I have a huge nose.
You do not know that she will never be interested in you unless you ask her out. Either she is interested in you, or you know that she won't be, so you can pursue other people.
I guess, I'll ask her out if I see her today.
I am glad that you are doing this. You are taking matters into your own hands instead of letting cards fall where they lie. You will know what to do next after this.