I stopped jerking off about 5 years ago (34 now) Whether placebo effect or not, I feel stronger, I have much higher self esteem, I work out more, I have better sex and last longer.
To be fair I have sex 3-4 times per week, If I didn't have regular sex I would have no issue getting an escort or going to a massage parlor.
I find it to be one of the best things I've ever done for myself mentally. I am too lazy to link to a couple of studies that show having actual sex, or even getting a hand job from someone else has a much different effect than you jerking yourself off alone.
Many men feel a lot of shame after masturbating, and also worrying about their porn habits being discovered.
Here's what I came up with as to why not jacking myself off improved my life greatly:
The added testosterone makes it much easier to get my ass to the gym and work out hard. I used to jerk off every morning in the shower and it sapped all my strength to go to the gym or start my day with energy.
It made me pursue women much harder including significant others. It made me be a better man and be attractive to them because I needed them to want to have sex a lot.
I don't ever feel the shame and sadness after blowing a load in a shower or watching stranger and stranger porn. I feel like a man.
Restraint is important in life, the ability to resist giving yourself an orgasm is as hard (no pun intended) as anything else can be. I am able to apply that restraint much easier now to things like food choices, and other bad short term decisions.
Being a fucking man. Once I stopped jerking off I became much more assertive. I immediately took less and less shit from people, said no to family and friend more often and went after what I wanted. It was not a matter of not cumming, it was that since I would only cum in a female after a nice hard fucking, I felt like a king, and when I didn't I still felt like an animal walking around and not willing to be pushed around.
By not constantly pleasuring myself, I ended up making myself many many times more attractive to women which then led to much more sex .