Weight loss tips?

I’m 17 and with PCOS diagnosed when I was 13 . Currently I weigh close to 100kg and I’m terrified. I’ve tried to lose weight before but it never really worked that well. I’m pretty self conscious even going for a walk outside triggers my social anxiety. I’m honestly struggling with what to do my doctor refuses to give me a referral to a professional to help me better know my body and how I can work with my pcos dietary needs