extemely struggling with weight

hey y’all so I’m 15 almost 16 but I’ve really been struggling with my weight for almost all my life. I’m well over at leasttttt 280 and I can’t take it anymore. I hate the way I look and my weight is all I ever think about. I do not plan to way myself as that will make me go into a extreme depression but I really at this point don’t know what to do. I try to eat healthy and exercise when i can but having bad depression as it is doesn’t help with motivation. Something that’s totally awesome is I can’t afford to go to the gym but like I’d kill to be able to go to the gym because I feel like it’s a good environment for my because it’s a motivational place. When I’m at home or out I just don’t have motivation for it. So yes you could say I’m extremely struggling. Plus to add on I have a severe fear of the doctor or anything related to a doctor so that isn’t good but id say it’s my worst fear. So I mean if anyone has any advice it would be very helpful cause I’m really struggling mentally and physically.