Messing around in my mind for a while can someone offer advice

lol go ask, worst case scenario is that she says no. if she does say no then I guess you guys won't make a great couple lol. rejection is fine, how long are people gonna make fun of you, a day.... maybe 2 or maybe a whole month and that's it they have other things to do in life . it's not that deep bro they'll forget it ever happend. plus you getting out of your comfort zone will help you realise that asking a girl out isn't hard.

Why would you get made fun of for asking a girl out?
And more importantly why should you care? It's your life, dont let the reaction of others dictate what you want to do

Buts its hard I just die at the thought of how awkward it'd be if she rejected then told her mates than the year would know and I have to sit right next to her like nothing happened

You miss 100% of the shots you don't take. You'll regret it more that you never asked her out, you don't know if she will say yes unless you ask.

The people who would make fun out of you are the idiots here, not you.

Buts its hard I just die at the thought of how awkward it'd be if she rejected then told her mates than the year would know and I have to sit right next to her like nothing happened

How likely do think it is that she'll say yes?

Well life is about taking risks (not that I would really call this a risk), do you just get along or are you actually friends with her? If it's the latter, you should already have a better feeling whether she reciprocates your feelings but if it's the former you really have nothing to lose, it's not like she will hate you forever and never talk to you again and you can just carry on being civil to eachother in class