ADHD and majoring something you hate in college

Could not pursue natural sciences for several reasons, I'm now in computer science. It's sucking the life out of me. I don't have access to meds yet. How do I endure this for now? and no, I can't transfer out. Please give me advice on how to be even slightly motivated for this. I keep thinking, if I were majoring in a different program, I would have excel led, I try to counter that by saying I'll still gonna major in what I like after my initial degree, after all, two degrees are better but it feels like it's not enough sometimes because right now I'm living in the present. Also, this is not connected to ADHD but I'm not even sure about living recently so that words kinda feel useless. Anyway, I still am sure that I want to finish this degree so please give me an advice. I was a smart kid in high school because I listen during class since the subjects were of my interest sometimes but now I can't even pay attention in class or study for fun just like before. No studying happens unless it's the day of the exam now and although I'm used to that study system in high school, I still get good grades before because I actually listen during lectures and sometimes read for fun. Now, I can't even do that and I'm not considered smart anymore and I hate it so bad. Please tell me how to get through this.