Hello and welcome to HCM.
As an
Urologist,i assure you,
masturbation is normal,with no side-effects.
At your age, most boys engage in masturbation actively, so don't worry.
Feeling lazy is only temporary mental feeling, which you must change.
Your future is otherwise secure. Develop interest in exercising, playing games,swimming,cycling,jogging, etc.
Music,
yoga and
meditation, also are great routines, you can start.
If you've any doubts,send them to me,as a direct question, for an expert opinion. Dr.Matthew J. Mangat.