@alenharry Honestly from your comments I hear a lot of excuses and a lack of discipline, not just in fitness.
Part of maturing is doing hard or difficult or not as fun things not necessarily because you always want to, but because they've got to be done. You may not have a lot of pressure on you right now to apply yourself more fully, but if you don't you will wake up as a 30 something probably deeply unsatisfied with their life and then you'll have to choose to buck up and do the hard things or stay where you are.
I don't mean to be harsh, but it's the truth. Practice doing the hard things now and be uncomfortable so that by the time you're older, you'll be in a better place.
Just go to the gym every day. You don't even have to do anything. Just put your shoes on, put some gym clothes on, take a water bottle, headphones, whatever you want, and go there. And then leave if you want. Just showing up and getting in the habit of going will a) get you out of the house and get your brain moving through space and b) prime you for feeling able to go and actually work out.
Find a program to do. It doesn't matter what it is. (The fitness wiki is a good place to start) But have a plan. It can be intimidating walking into the gym and having no idea what to do. Most people in their are following a program and they're going through things methodically. If you do that, you can treat it like a checklist and think less about the other people. Look up all the exercises in the program on YouTube and learn how to do them. Practice moving your body in the exercise at home.