Replying to Should I do it? I need help!

Hey, i met this girl about a month and a half ago at my local mountain, who i go to school with, and we really got along, we met up a few more times to go skiing (before i got grounded), and we talk a lot in and out of school (we're working on 27 hours straight right now, with combined texts and ims, except the 4 hour break to sleep) and she seems kinda interested in me, and i know i am in her,  but i dont know what to do, should i ask her out? play it safe and just stay friends? because i dont wanna ruin things between us if i ask her out and she saays no,  NS i need your help!

(please only helpful posts, i dont need anyone flameing me for whatever)