I can only reassure you that your experience is not typical ad I would look for another underlying nueroednocrine disorder before summarily blaming weed.

Some very intelligent individuals who smoke weed (I am purposefully limiting this list to verifiable lifetime HEAVY users because the list of of all successful, high achieving cannabis users of note would be too long)

Abbie Hoffman, Allen Ginsberg, Andy Warhol, Anjelica Huston, Beatles, Bill Murray, Bob Dylan, Bob Marley, Buddy Rich, Carl Sagan, Cheech Marin (my peronal favorite when he PWND in celebrity Jeopardy), Douglas Adams, Dr Francis Crick, Duke Ellington, Francis Ford Coppella, George Washington, The Greatful Dead, Hunter S. Thompson, Jack Kerouac, Jack Nicholson, Lenny Bruce, Lewis Carroll, Lord Byron, Marlon Brando, Mary Shelly, Mick Jagge, Miles Davis, Niel Young, Oliver Stone, Oscar Wilde, Pablo Picasso, Paul Simon, Peter Fonda, Pink Floyd, Salvador Dali, Samuel Beckett, Sinead O'Connor, Sigmun Freud, Tenessee Williams, Sting, Willie Nelson, Woody Harrelson, et al