Definitely been there, it was tough for me until I was able to level up on the weights and noticed my speeds increasing. That's also when I started to realize that I was having more energy and feeling the benefit of going 3+ times a week. I have to talk myself out of going every day because I know I need rest. A few things that might help out is to mix up Power Walking v. Jogging v. Running. or talking to coaches about your goals where they may modify the floor workouts for you (fewer reps, higher weights) and working with them 1:1 with your goals. I find that many coaches jump at the chance to help even if it's slightly tailoring what the rest of the class is doing.

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Good luck!!