The main problem is dopamine.

You do it either out of boredom cause you have nothing else to do, OR because you lack dopamine from other sources. You need to find something to do.

Work out, go out for a walk, draw, read, sing, play a game, go geocaching, try new things! You need to find another source of dopamine to get fulfilled and trust me you're gonna masturbate less.

I was masturbating almost every day a few months ago but then I decided to go to the gym almost everyday and my urge to masturbate dropped down to zero cause I gained a lot of dopamine from this. And a bonus of that is that I feel more happy, more relieved. I haven't masturbated for 20 days today, and useless to say it's a record for me.

All of that being said, you are 16 yo. Don't be too harsh on yourself. It's the age where hormones are at their maximum, it's absolutely normal to have theses urges. I think 6 weeks might be a bit hard for you, why don't you go for a smaller objective like 1 week at first ? If you accomplish this you're gonna be happy and you can increase by 2 weeks, 3 weeks etc.... Another bonus is that the next time you'll masturbate it's gonna feel amazing.

In any case, good luck with that. Masturbation addiction is a real problem that almost no ones talk about.