Welcome to HCM
We understand your concerns
Every teen age finds pleasure in keeping the semen "stop" while climaxing. Quite normal. Nothing happens except the semen finds its way out during sleep. Teen agers all over the world do masturbate once or twice or even thrice daily. Quite normal. Restrict to one if you are unhealthy. Energy is definitely lost during masturbation
. But not to the extent that you always feel dizzy. Eat good nutritious food and stop worrying about masturbation. If you are doubtful, then decrease the quantum of masturbation. That is it.