I have experience.
I hated exercising when I first started and hated sweating. Yes, I still feel self-conscious and avoid running on roads, but I still run in front of people on the athletic track I use. You know what? I believe that if you are putting in a genuine effort to exercise, people will actually look upon you positively, that you want to change who you are.
I know how hard it is to look into the future and picture what you will look like and to forget what people will think while you are working towards your goal, just remember that it will get easier as you slim down and feel comfortable about yourself. You are doing it for you, not for them.
As for the fitness side of things, it's a matter of pushing past your comfort zone and those barriers that got you to where you are in the first place. It is hard and you will feel the burn. I did 2x 6 kilometres (almost 4 miles) this week and my muscles are sore, but you know what, I wouldn't change that because I know I am better off. When I first started in January, I couldn't fast walk 100 metres, but I got out there and did it. My muscles have grown stronger, my weight has dropped and my body, skin, longevity are better than what they were.
Consider exercising comfortably as your first barrier and wanting to exercise as your second.
