I think you already know the answer to your question. Of course you should seek help. If you could shake yourself out of your lethargy, you would have done it long ago.
I do have a theory: Many students who excelled in high school hit a wall when they get to college. Having been a star at high school, they suddenly find themselves as merely the average among all the other high school starts who made it to college. The academic competition is something they are not used to and are ill prepared to cope with. Rather than deal with the reality of having to study much harder to get even average grades, such students stop studying at all. Often they get over-involved in a campus club or team or (as in your case) something or someone on social media. They can then tell themselves that if they studied they would still find school easy and would get the As they are used to. It’s a face-saving coping mechanism that quickly turns on itself. Instead of protecting the student from failure, it guarantees it.
Thhis type of strategy becomes a negative cycle: The more the student avoids the work, the more likely they will fail. The more likely they will fail, the more they busy themselves with the thing they landed on to avoid failure. They isolate. The result is that they not only miss the academics but they also miss the whole college experience. They don’t socialize much and so don’t make the lasting friendships or the mentoring relationships that are just as important as getting the grades.
I don’t know if this applies to you. It’s at least something to consider. Whether or not you fit with that description, you know you are in trouble. You are missing out on college. Someone is paying thousands of dollars for you to scroll through your phone. I urge you to get yourself to your college mental health services if available (a community provider if not) and put a stop to the negative cycle you’re in so you can begin to build a positive one.
Yes, you can do it. You made it to college so you can probably succeed at it. You may need some guidance about how to study and how to balance your outside interests (including the band) with the demands of school but you are smart enough to manage it. Get the help you need and deserve.
I wish you well.