 That's an interesting question. Sexual activity doesn't directly cause hair loss, but hair loss is caused by interaction of the follicle with testosterone, which you of course know is the main male sex hormone. And sexual activity increases testosterone production. I'm not a doctor, but at age 18, I suspect that your testosterone levels would be about the same regardless of how much ejaculation you're doing. (And the masturbation frequency you report is low for your age.) If it's in your genes to be bald, it's going to happen sooner or later. The only cure for baldness is castration. And you don't want to do that.
If I were you, I'd enjoy my sexuality and not worry that it's increasing my hair loss. You might also pursue hair loss treatments, like minoxodil.
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