I'm close to one year at this company, and so much has changed. the amount of responsibility i have now is insane compared to last year. we'll have an intern this year, so there's gonna be someone learning the ropes from me. I'm having a say in bigger projects , I'm schooling people way over my pay grade, people actually come after me for help now, that's insane. what a fucking year

Ask for a raise. If they accept it, yay!
Buuuut, they may pretend to be insulted, in that case gou know you gotta GTFO. They may say there is no money in the budget, in that case you look for another job for those guys are toast and on life support.
Or they might ask why should you get a raise (noob question) and if after you tell them you are delivering much more than you used to they dare say "no you ain't!", they are stupid and you should look for another job.
The only way you can stay after realizing you are being undervalued is if they come with some pretty damn convincing arguments for why you should not be paid what you know you are worth.
Beware the bullshit that they might attempt to fool you with.