I can't help but wonder, are you not sure what age you are?
Sorry, anyway, the 2nd picture shows the temples are receding, in your early 20's they usually shouldn't be back that far. You can picture a line of where a strong or common hairline would be, to where it probably was a few years ago, and yours is undoubtedly going back, sorry to say. But hope that gives you a kick to accept it's happening, and get to work on it (which isn't as hard as it sounds).
I'm not a great judge on Norwoods but maybe approaching NW2. Which isn't bad at all, the good news is you can pretty much try to maintain the hair you still have and you'll never be regarded as "bald" or even noticeably receding, so you don't have to worry much about re-growth if it doesn't happen for you.