Recently, since the start of this year in particular, I’ve been feeling rather ‘off’. Its getting harder to muster the motivation to start on things (drawings, assignments etc) and I’ve started doing less and less of the things that I love to do. I’ve been drawing less even when I have a lot of time, I hardly watch my favourite variety shows, kind of thing. I find myself wanting to just stay in my room, lying down in bed and maybe play games or scroll through sns. I can’t focus on tasks and my appetite’s kinda lessened (I’m still eating, but it’s not as proper as it used to be). Although I do have fun when I’m out with my close friends, most of the time I’d rather stay alone at home and not talk to anyone. Maybe I’m just reading too deep into things but there’s this little voice in my head that keeps telling me that my course mates find me irritating or they hate me, kinda thing. Idk. Everything’s so weird. Even when I have fun hanging out, I come back home thinking “oh... I shouldn’t have acted so excited just now... They must think I’m weird.” ...idk. I’ve thought about seeing someone to consult about this but I don’t think it’s that necessary.... It’s mostly just me overthinking stuff, I guess. I want to tell my close friends but I guess I’m not ready ? I trust them but I guess I don’t want them to see this side of me..... Idk. Does this make sense ? What should I do, really ?

What you're feeling may be depression or maybe anxiety. Trust me, I go through the same thing. I understand that you may not feel ready to tell another person, but it is good to have someone to vent to about your feelings.

I've been experiencing similar moodswings.
Personally I have found doing sports/exercising/moving my body to really lift up my motivation again.
In my case that's Badminton but it can really be anything.

Additionally I've noticed that I need to actually "work" on things and finish them. That really makes me feel better - I guess you could say it's a sense of accomplishment?
For examply I've been doing some modding for Stronghold Crusader and Stellaris lately and whenever something works out the way I wanted it to I just feel instantly better.

Of course I am also lucky to have been blessed with great friends and a loving family but I don't mention these kind of things to them. I prefer not to worry them and try to fix my issues myself.
That habit has gotten me into trouble occasionally but it's not something you break out of easily...

Anyways: it's often best to not read too much into things. I have to tell that to myself often enough, but most of the times people really don't mind your behaviour. Afterall you are friends for a reason. Everyone is a bit weird sometimes and does mistakes, but being friends means accepting that and loving each other in spite of it.