Working for a startup and I can't tell whether I'm in a sweet spot or not

I am a finance student and I have three more years to graduate.

I landed an internship at an e-commerce company and have been working there since June. Recently, I got a full-time offer and they are willing to make the hours flexible for me so I can do both school and work when I get back to my classes.

The company is new and the revenue is small (think 5m-10m), but the profit margins are sweet (think 15%-20%) even though it is in the growth section right now and there are a lot of expenses.

I mainly do basic monkey work: boring, monotonous, repetitive tasks all day long. As a person with ADHD, that is very hard for me. Sometimes I feel like I am literally being tortured to death. I get physical pain in my brain, but the work needs to get done so I do it.

I do not enjoy the work because it is not mentally stimulating. Even though the work is simple, it drains my energy a lot because it requires a lot of focus. At the end of the day, I feel like crap and I crash on my bed real hard. This makes me feel bad because I cannot focus on my side projects. Those products I am doing are the reason why I always kept a very healthy mindset. I like keeping my mind active, but I cannot do it as often as I did before I took this job.

I am in the decision-making team in the company right now. I can change things in my own way and if they are more efficient, we keep them. I like being able to get my thinking into action and then see the fruits.

The pay is eh right now. I do not think I get paid enough for the hours I am working.

The company is growing fast and it has solid suppliers. I imagine it would start hitting 15mil a year in the next two years and with it, I can grow too. I have three years until I graduate and I reckon I could get paid at least 130k by then. It is possible and I am going to be the senior in the company.

My manager is nice. He is a very understanding person and we work efficiently. We did not have any problems so far.

Considering I am studying at a semi-target and the difficulty of breaking into high finance from the school I am attending, when I assess the situation and create a pros and cons list, it makes more sense to work in the current job I am doing and really give myself to it.

But here is the problem: I just cannot do it. For me, to do something, I have to see my future in that thing and I have to be really passionate about it. Otherwise, I cannot do it. I lose interest and after some time, I just snap and leave the situation. Even though I could be a senior in a future unicorn startup and make bank in the next 10 years, I cannot really grind hard.

My passion is public markets and I like everything about them. Researching, analyzing trends, and macroeconomic events are joy to me. I cannot tell you how much dopamine I get after reading a well-written article in WSJ. Hell, one of my professors worked at Jane Street and the conversations we had were very thrilling. I want to be in an environment like that and meet people like him.

What would you do if you were in my shoes?