really need some advice!!

okay so this is kinda long. I met a guy a while ago but we didn't start talking until about 5 months ago. I thought I had the biggest crush on him, until he asked me out. The date is tonight and I'm so terrified!! I feel like I should still go bc its a little late to cancel now, but I also think that maybe I'm just over thinking it? I really don't want things to move too fast, and he's moving out of the country soon anyways. I really don't want it to be awkward, but I think it might be. I just really don't know what to do. Should I try to make it work? Should I tell him that I just can't be invested in something that's gonna end so soon? Please help with any advice you can give!!