In addition to restricting your calorie intake, exercising, and doing something about your self-esteem, you're really going to have to learn to like vegetables.
You should try preparing them in some different ways. If you're just eating the same old steamed broccoli or canned green beans, you should explore other ideas.
Try roasting them! Carrots, onions, and even brussels sprouts caramelize when you roast them. You like caramel, right? Well, it's not exactly the same thing, but they do get brown and syrupy and slightly sweet on the edges. And roasting creates incredible layers and layers of flavor. It's good, it really is.
Also try grilling. You can grill on the stove or under the broiler if you don't have an outdoor grill. Try some asparagus, after brushing them with two parts sesame oil, one part soy sauce. You'll be able to get them down, trust me. Even if you can't eat the stems, you're getting somewhere.
That's my advice, and not just about vegetables: eat less, but eat better. Get involved with your food. Learn to understand it. Get some interesting cookbooks and start screwing around. As you learn, you'll learn to satisfy your appetite AND you'll gain confidence as a competent human being, which will make you feel a LOT better.
Start walking for a half-hour each day. Walk around the block if you have to; it doesn't matter.
Don't obsess about the calorie count, and don't freak out and just give up the second you fuck up. Everybody fucks up. Just get back on that horse and ride.
Change your profile picture so it's not you eating something out of a jar!
I don't know how old you are, Van, but be aware that most of the people you see walking around have been pretty screwed up inside too. When I was as young as you look in your pics, I was a miserable ball of self-loathing. You've taken a fair amount of abuse here on Questionland, and maybe other places as well, but that stuff DOES NOT MATTER. You're not a freak or a dummy or a fatty -- that's not your identity. You're just a guy trying to dig yourself out of a hole. You can do it.
You should probably try and get some counseling.