Time for SELF-IMPROVEMENT

I've had a problem with weight gain ever since I was about 12 years old.  I am now 186 lbs and s unhappy as I've ever been.. I've always tried the "healthy" diets that never ever work.  I've also had my fair share of unpositive criticism from family and others in my school. But, today that is changing.  I'm going vegan, I am so sick and tired of criticism from everyone about my weight and size... I've been doing research and I hope this works.  I've also excersize do almost everyday, always training for my sports! (Basketball & track and field). If you guys have any tips I would love so recommendations, please send them my way!  Thank you all so much!!