my sperm is clear

It sounds like you are a very young guy who is not making sperm yet, just precum. Precum is a clear and slippery liquid that runs slowly out of your penis's piss hole when you get erect and excited. That dry white foam is from the jacking off motions inside your penis tube making some air bubbles in your precum. Lots of guys have different amounts of precum and some have little or none. Some run a lot whenever they get erections, some only after having sex for a while. If you are a very young guy, don't worry with more time your balls will start making the normal white, yellow, or gray thick and cloudy sperm loads that most men shoot out. Jacking off won't harm you at all and it might even help speed up your nuts' sperm production by emptying out your balls more often and pumping more testosterone into your blood stream by sexual excitement while jacking off. By the way, many young guys can get orgasms again and again in fast time periods when they are young. A talent that they usually lose more and more as they get older. Try and see if you can shoot and orgasm again and many times in a row for more pleasure. It won't harm you at all. Your penis will just stop working once you're emptied out and tired. Then with enough rest its all ready for more sex, just like if you had sex with a woman over and over again and shot into her many times.

My sperm is clear when I masturbate, and sometimes a dry white like foam comes out. What's happening to me?

Hi user
It is normal for your sperm to be clear early into puberty as you continue to go through puberty it will be white all the time later on.
There is nothing wrong and nothing to worry about.