Track runners, please help me? :(?

I ran cross country in the fall and I turned out pretty good. I wanna do track but I don't know if I can sprint that fast. I can sprint pretty fast into the shoot for cross country. I'm not sure what to do. What if my body gives out in the middle of an event? I'm pretty strong though, and I've never quit in a cross country meet. help! :(( i'm really scared. i've never done track in my life but i do distance sports (xc, cross country ski racing)