Please take this with kindness. I've been off work for 4 months due to burn out and I wish this is how someone explained it to me 20 years ago:

There is no need out there in the world that is so unique that only you can meet it except for taking care of yourself. No one else can know your needs as well as you do and fulfill them for you. If you are not taken care of, you will not be able to do anything for others. Wise people don't ignore maintence and expect a machine to just run infinitely, right?

There is no shame in struggling and asking for help, just as there is no shame in struggling and taking a break. Focus on your schooling and self care. This will equip you to better care for your comrades when you have more capacity.

I constantly worry thar when someone complains about a certain opinion/person whether it includes me,

I say this to myself all the time "What other people think of my is none of my business", but also in this case they aren't thinking of you as an individual so there is even less to worry about!

because I can very easily slip back into things like complacency or reformism if I don't stay vigilant.

As a practical tip I'd suggest adopting "I don't know enough to form an opinion" as a mantra. That way you don't need to worry about them lumping you in with a group that is complacent or supports reform because you simply don't have an opinion on the topic!

Obviously this doesn't work if it's something you need to make a decisions on, but global politics? Do you influence it? No? Stop worrying about it right now.