Looking For Some Support

Hi, my names Jonathan and I am a 17 year old boy. I can't stand being in my own body, looking in a mirror is terrible, and I've been this way for years. I am now using this app and a little weight is coming off, but I fell of track a few weeks back, and am finding it hard to come back. It's difficult for me to tell anyone how I feel about my weight, I just bury the issue. As so I am not getting any support from family or friends, and I think that's where the issue is. To have to tell people that I am overweight is too embarrassing to me I never take my shirt off in public anymore, I refuse all invitations to pool parties, and I get dressed in the bathroom so no one has a chance to see me in the two foot walk to my room. Everything I do, every time I am talking to someone I feel awkward and unhappy, which has caused me to slowly draw into myself, not wanting company. Has anyone else gone through this? Is there a way I can turn it around, and how could I tell my family that I hate my body and am going to diet? And, does it get better? I feel that getting support is going to turn this around and I am hoping I can find some here.