What type of meditation technique are you using, exactly? Because the answer may be different, depending.

I do mindfulness meditation, and if that’s similar to what you’re trying to do, you should know you’re already doing it.

I understand why you feel that noticing your leg is uncomfortable, scratching yourself, noticing you’re thinking about nonsense things etc is not-meditation. In fact, it is called the wandering mind. Whenever you notice wandering mind and resit, you experience returning mind. This experience of returning mind is what meditation is, especially at first. After a while you may experience absorption, where the mind doesn’t wander anymore, and that’s nice, but that’s not something you have to wait for. (You could be waiting a long time.)

Did you know that when you lift weight to become stronger, you have to lower the weight before you can lift it again?

Wandering mind – returning mind. Wandering mind – returning mind. This is meditation. I hope it will do you well.