Hi, I Am 20 Years Old,female,and I Weight 100kg And

Hi, I am 20 years old,female,and i weight 100kg and i have an underactive thyroid,hypothyroidsm.I have been trying to lose weight for years but nothing has ever worked,i trained a lot,did cardio and high intensive workouts but i never was able to lose weight.Now i'm thinking about joining herbalife so here's my question:do you think it will work,will i be able to lose weight?If not please help me find a way to lose weight because i need to do it as soon as possible.Thank you in advance.