Scared of his penis

I just started dating this guy and we attempted to mess around last night. He asked me to jerk him off so I put my hand around his dick and it was too small to jerk off. Like when my hand is around it you cant see the dick at all anymore that's how short it is and when I tried jerking him off my hand kept just flying off because there's nothing to jerk. He wanted to have sex but his penis made me so uncomfortable I told him I felt sick and went home. How do I handle this situation? I can't tell him hes too small to do anything with