Have you ever thought about it?

Well, I know I'm good at everything.

I must be really great at extreme high altitude underwater basket weaving.

I think to be ''really good'' at something, you need a fair amount of practicing
It would be more correct to say ''have the potential to be good at something''

I must be awesome at giving a damn.

*starts to sing try everything*

Probably League of Legends..........
I'm okay with never trying that.

I'm probably good at sex.

Entirely possible

For me that was beer pong