Am I being unhealthy to this new friendship? 20F/20M

So I (20F) just became friends with this guy (20M) over a online fps game and Discord.

But this guy. I don't know how, but we completely hit it off (in my opinion at least). We've been talking every single day for the last 20 days (i went back and counted lol). We constantly are playing games together after we both get off work, i watch him play games, and we've shared music tastes and recommended each other songs, everything has been amazing. He recently showed me what he looks like and so did I.

And that's where i believe i'm being unhealthy to this new friendship, I find him very attractive and cant help but attempt poorly at flirting. (i'm so socially inept that i don't know if i actually am flirting half the time or not) I'm constantly thinking about him and how he is doing, and honestly just wanna talk to him all the time.
But i'm just scared because i've never had a male friend before. i'm not attractive in the slightest (he called me cute when i showed him a pic of myself, but i think he was just trying to be nice), so this guy that wants to actually spend time with me is freaking my brain out and thinking of him romantically. I feel guilty about it. Like here i am obsessively thinking about him while he probably just wants a normal friendship.

But the other thing is, i think he has flirted with me before? or maybe just in a joking way? i'm not sure, i don't know the difference between the two because i've never gotten attention like this before. I mean we have talked about gooning before LOL and after that he cracks some sexual jokes which i find funny (but half the time don't know how to respond because i am STUPID)
I just want to make this friendship last though. Even if i have a small crush on him or not, i'm thankful for him because he does make my days better. This is the first time in my life where I have chatted to someone every single day.
I just feel like i'm spiraling.