Masturbating does not affect the growth of your penis. It will not make your penis larger or smaller. It is a very healthy thing to do and you should do it as often as you want to. It helps relieve stress, it releases helpful chemicals in your brain that help your immune system, it cuts down on your chance of getting prostate cancer, prevents wet dreams, and all sorts of other good things.
A tip though: Don't use soap in the shower as lube. If you can, buy some real sex lube at a drug store or grocery store. It will be near the condoms. Don't be embarrassed, the people who work there sell hemorrhoid cream to old people, they really don't even look at whatever you buy.
and whoever told you that is stupid, it makes it hard, so it gets bigger at the time, but that's it.
In fact, masturbating doesn't really effect you in anyway- and it will not make you blind!
A tip though: Don't use soap in the shower as lube. If you can, buy some real sex lube at a drug store or grocery store. It will be near the condoms. Don't be embarrassed, the people who work there sell hemorrhoid cream to old people, they really don't even look at whatever you buy.