File. Do the paperwork! ASAP! It’s easy and probably free.
I say this as someone who neglected my taxes when I was self-employed, so I wasn’t making regular payments via paycheck deductions.
It was expensive and it cost me some job opportunities.
You can file cheaply and maybe free online. I have used both freetaxusa dot com and turbotax dot com and they do a great job of completing your return by asking a series of questions about your income and expenses.
Just do it. Pay the penalties (which increase every month) and square up.
By the way in the USA the penalty for late filing (4%/month) is ten times times the penalty for PAYING late (0.4%/month).