I am not sure if you are talking about masturbation when you mention bad habits or anything else because your writing is not so clear, but if you are talking about masturbation, then you are making two errors by first calling it a habit and then calling it bad - both are incorrect.

Masturbation is not a habit and is not bad.

Just read Wikipedia -

"Masturbation is the sexual stimulation of one's own genitals, usually to the point of orgasm.[1] The stimulation can be performed using the hands, fingers, everyday objects, or dedicated sex toys.[2] Mutual masturbation, which is masturbation with a partner, can take the form of non-penetrative sex.
Studies have found that masturbation is frequent in humans of both sexes and all ages, although there is variation. Various medical and psychological benefits have been attributed to a healthy attitude to sex in general and to masturbation in particular, and no causal relationship is known between masturbation and any form of mental or physical disorder. Acts of masturbation have been depicted in art worldwide since prehistory. While there was a period (from the late 18th to the early 20th century) when it was subject to medical censure and social conservatism, it is considered a normal part of healthy life today. It is commonly mentioned in popular music as well as on television, in films and in literature."