Thank you to everyone for your replies!
I never really considered this up until now but now that you say it, I think that definitely rings true. Thank you! Also a lot of design friends say that they didn't had exactly much to do in their agency and oftentimes just sit there and wait until they can leave.
I already worked in retail for a while before I started studying Design and while it was physically exhausting, I had a much better creative output during that time than when I studied English (not my cup of tea so I obviously dropped out). I don't really mind working in retail but I agree that having more money is always nicer.
I generally feel the same way, but somehow my studies still drain me a lot in my creativity. I currently am studying abroad and can't take any design classes so I have more theory-based classes and I became much more productive compared to my home uni, the change is really immense. I don't know why. (Okay, my uni is very focused on conceptualised and interdisciplinary design works, maybe that adds to it but in general I'd also say it's just. a thing you do, not something you create.
I definitely want and will work in the creative field later on, the retail thing was seriously just for the time I work on my comic because seriously, if I didn't want to work in the field, I wouldn't need to study it.
I personally liked working retail in some ways (definitely made me lose some pounds) and while Christmas business is busy and exhausting, I didn't find it terrible. I didn't have many hours (I think it's been like 25-30h per week) and it was enough money for myself at least.
I think I still need to find a way to get more into a routine, this is a major thing I lost during my design studies I think because uni work just piled on everything and had to be priorised and now that the workload lessened, I'm completely out of swing.
I think that's also a reason why I want a fixed daytime job in first place because currently I struggle a lot with maintaining a routine and having stuff piling up on end. I think that's something I'd consider as a more seasoned designer later in life.
I currently just really want to finally do it, if that makes any sense? I find it hard to prioritise sometimes, especially when it's a story that I'm so deeply fond of. I'm scared I won't do it. But yeah I guess taking my time with this decision is the best advice right now, and I most likely will try out agency work at first, depending on how the internship went.