From what I’ve seen, engineering is just a lot of physics classes. If you’re struggling, definitely you’ll need to develop more serious study habits, but it’s worth it. There’s so few good stable jobs left, and engineering is one of them. Maybe find a tutor, good YouTube lectures, maybe Khan academy. Whatever it takes. Maybe you need to do each type of problem a dozen times to get it, not just once. That’s a bummer, but it’s worth the effort. School is much much harder than real world. Everyone I know who is an engineer agrees that the schooling was the hardest part.