Do I properly file my taxes when I had a full time job year round, but an onlyfans for 2 months?

All of 2020 I held a full time job which was my main source of income. I made about 20,000 in gross income. I have a w-2 for that. I’m a student I’m not a dependent I’m not sure if that matter anyway. Towards the end of the year I had an Onlyfans and made about 1,600 in gross income. I received a W-9 for that and I’m aware that I have to pay self employed taxes on that (on top of regular taxes) or something like that. 
The problem is I have no idea how to file my taxes that is the only question I have is what package do I buy or can I use the free one. Am I really considered self employed in general when my primary income was not self employed? 
I just want to know which package to buy that’s my only question. At this point I really don’t care about write offs anymore I just want to get it over to it.

To anyone reading this if you’re thinking of starting an onlyfans please don’t. I mean you already heard of the reasons why you shouldn’t from certain people but when tax season comes you will regret it. They didn’t send me my W-9 form. When I emailed me about it they just claimed that they must have and so fortunately I was able to look around my account and download it off my profile before it was permanently deleted since I was already in the process of closing it. Just everything about that site is horrible lol.