Meeting my new crush in person tomorrow...Help?

Okay, so me and this guy, Curtis met on facebook like 3 days ago and we're really startin to like eachother. so he asked me to hang out tomorrow... I know he's not a creeper cause he's personally friends with my Best Friend and my Ex... lol. But I'm like really insecure and stuff... Any ideas on how to relax and feel y and confident? Anything would be appreciated(: