Deepening your Voice

Years ago saw a show where a speech therapist helped people do it.

Trying anything yourself would probably sound forced and end up being ridiculed

As another poster said, we need to know how old you are. Traditionally puberty is the point at which the voice deepens, sometimes very suddenly and dramatically, but often, as was my case, dragging on for some years into my late teens with just a very slow and gradual decrease in tone. If it's any consolation I have (so I am told) a very deep voice now, so the fact that it took so long hasn't had any 'detrimental' effect.

The same thing can also happen with beard growth. Some guys almost wake up one from morning to the next looking like wolf man jack, others go on for years with just what my mother called "bum fluff" and don't begin shaving properly until quite late in life.