My suggestion is to look at this monitoring thing as something that it’s gonna be your company and that the more you feel frustrated for having it, the worse. More presence it’s gonna have.

You will get big moments where you let yourself flow. Look for things you enjoy and are interested in, try to focus on it as much as possible, trying to forget there are people in the street, you focus on the person or the task you are doing, widely enjoying it as if you were alone.
Don’t punish or get upset with yourself if you don’t get it from the get go. Try it again.
Then, do the same with other tasks you find more difficult.
I know it’s very well known but “practise makes it perfect”. Only, don’t be hard with yourself if you get distracted by you know, this little voice in your head always creating thoughts, and thoughts to discredit you.

I’m like you. I’m trying it. For example, in my case, I get it focussing on my doggies, also when I’m with a person, focussing on what the person is telling me.