Keep up the good work!! My club wanted to vote me the most improved rider of the year. I lost weight and changed from a hybrid to a road bike. Let me tell you. I pushed myself much harder when I was heavier. To other people I was slow, but I never work that hard any more. It will get easier. Once on a really difficult climb, I was breathing hard (overweight and asthmatic) and a young dude came up behind me and pushed me a little ways. I felt like crying, but I didn't. And then, there was no way I could stop when he stayed within eyesight so he encouraged me two ways.
I saw a really heavy person on RAGBRAI last year, probably 350-400 pounds. His face was red and he was really working hard. I wanted to say something encouraging to him, but wasn't sure if he wanted the attention. You have to start somewhere and when you loose weight, somebody will have something to say to you about the bikeshorts, so....just ride and smile..cause it will always be something.