Shaula, Hurray for you for doing things to help yourself be more healthy. Keep cycling- it can only be good for you, and maybe you will be even more motivated to eat healthy foods and portions as part of a plan to increase your energy and enjoyment on rides.
I'm not significantly overweight at this time- but over the last year, I've lost 23 pounds with weightwatchers and cycling. I'm only 5'1", so it is a substantial change. I have been very self-conscious about my weight in other settings though, so I can sympathize with you.
I love to eat too, and the only way I can successfully stay on track with cutting back is to visualize that I'm not giving something up, I'm getting something really great by eating smaller portions and cutting out things that aren't so good for me. Over time, I've noticed a greater appreciation of more subtle flavors in fruits, vegies etc.
I don't know what to say to/about the insensitive people... I see people of all shapes and sizes on the well-used cycling route I often ride on weekends and I've never heard an unkind word said to or about anyone's size or shape at the shade ramada where almost everyone breaks for water and a rest stop. Hope that's helpful and encouraging.

