How to stop masturbating so much?

Try taking long runs or ice baths

Just stop . Lol.

It's pretty difficult to masturbate too much, obviously if you're going on a date and you think you might get lucky you don't want to masturbate before you go out. Other than that it should not be effecting your sex life unless if you depend on something else when you masturbate, like porn or something else that turns you on that you can't use with a partner. If you use something like porn every time you masturbate you're training your brain not to get excited unless if there's porn available. Then when you have sex with a person and there's no porn your brain can't get things started because you conditioned it to react to porn.

Keep your hands in your pockets

If you are not doing it more than once or twice a day you are not doing it too much at all. Daily sex is fine.

Have sex more often instead.