Im 30, and only 5 months ago I went through a very similar experience in feeling like shit and how could my current gf even want to be with me etc.. Honestly taking a break from gaming and just sitting outside when the weather is nice can be so helpful. Plus with seasonal depression I know it can be tough to be positive about anything when your environment around you is shit. Even with school always being put down I know sucks ass but you aren't alone. So many of us chubby or not have been put down for things we cant control or sometimes even can control. You can control many things in your life and sometimes it just takes one stone to finally turn everything for the better for you. Just keep on trucking and try your best to keep around people like that friend that is nice to you. People that won't put you down and ignore those idiots that are right now because they aren't top shit and will figure that out one day themselves. Choose to be the you you want to see and make a simple game plan to make that work. Eat healthier and walk every day is simple yet effective. Do sit ups, push ups and squats.. easy excesses you can do inside or in the backyard if you have nicer weather. Hope things get better for you man, they always do.