I am addicted to meth and i have tried to stop but jst end up getting high again! plz help!?

i have smoked meth for 2 yrs already i have tried to stop i have even told my prnts! but its so hard to stop! i dnt 2 try rehab cuz i have a son! n i dnt wnt 2 loose him! wat should do! also idk if my bf knows dat i smoke it! i think he does but jst dsnt wnt to believe it! PLZ HELP!