Well I think the key for me was the phisical excercise - the body and especially the mind requires it to be healthy, and martial arts just gave me something that I could consider “worth it” in the long run, and has its own very deep history and practice to explore and progress.
And after I got started the whole mindfulness thing just happened naturally as it was an integral part of the training itself, so it just made sense.
And with mindfulness my mind just naturally calmed itself down, I started to appreciate the moment more, and care less about stuff I couldn’t control anyway.
I never could start doing the meditation thing before on its own, but when I put myself in an environment were it was just par for the course, it was easy. I’m sure there are other ways to do it its just what worked for me.
I think I now just try not to do exactly what I want, but rather try to position myself into environments where that happens naturally, and just let it be. Sometimes it doesn’t work out exactly, but mostly it does, and is much _much_ less stressful.
Hope this is useful and best of luck :)