Never Filed W-2

Hello, 

I’m here because I need urgent help. I’ve never filed my W-2 in the 4 years I’ve worked. Only because I would always chose to pay taxes every check and always made under a certain amount of money. I wasn’t aware you still needed to file. Now I have to do all the taxes for every year I didn’t file but I don’t have those old W-2 what should I do. Please advise me in any way you can and I will do whatever it takes to solve this issue.