Now we're getting to your root problems. Crippling lack of self esteem and bad body image are two dogs that feed each other at your expense. You feel bad about yourself because you don't like your body, so you feel too depressed to go outside and exercise, so your body gets worse, which makes you more depressed.
Listen to me. I want to help you. I've lived with depression my entire goddamned life. Start with stuff you can do alone, but takes you outside. Hiding in your house will not keep you motivated.
Go for a walk around your block every day. Or go for a walk in the woods, every day. Or go swimming on a beach or in a river that not many people go to, every day. Or go swimming in a pool when not many people are there, every day. Sign up for a yoga class, and go to it, every day.
Most importantly, GET THE FUCK OUT OF THE HOUSE, EVERY DAY. Those four walls are closing in on you. Trust me, believe me, I want to help you. Ask anyone on here if this is good advice for someone like you.
Small steps, but consistency is everything. Do something physical, every single day, no matter what, no fucking excuses tolerated. I don't give a fuck if it's raining, take a walk anyway. even if it's just half a mile or one kilometer. Rain won't kill you. Depression will.
Walk that fucking kilometer. Realize that you can, in fact, walk a kilometer. You know you can, because you've done it. Now walk 1.5. Now change your path so that part of it goes up-hill. Go someplace pretty with nice things to look at and keep your mind occupied, like a forest, or beach, or mountains.
Do it and you will feel better. Or don't, and you never will.