First of all, I want to say that your question is normal. At first, you will encounter some problems, mainly how to adjust yourself.
And don't attribute this problem to fitness. Think about whether you have other bad habits that cause poor sleep. For example, I know three things to pay attention to before going to bed. I hope it helps you. First, don't do a lot of exercise an hour before going to bed. Second, don't eat snacks half an hour before going to bed. Third, iron your feet with hot water before going to bed every day.
If you do a certain amount of exercise every day, as long as the method is right, it will definitely only be good for your health, and there is no harm. You have to understand this, it can enhance immunity. I am a college student now, and I insist on going to the gym every day. I haven't caught a cold for two years, hehe.
Adjust yourself more in the future I guess the problem is not serious. Don't have too much psychological pressure. The main thing is to control the amount of exercise and have more rest.
Finally, I hope you can succeed, eat well, sleep well and be healthy, hehe (embarrassed)