If you think you are embarrassed now wait until you put on your first pair of cycle shorts. Even before going out in public you are going to feel like 6 pounds of sausage stuffed into 5 pounds worth of casing.
There are a lot of other directions to look than at you. Let 'em look. Let 'em get over it.
If you ride you will lose weight. You will lose weight faster by watching your diet and riding.
You will be smaller.
Then the comments made might be more like "Hey, good work!"
Don't put off riding because of what people say today. Ride into the things they will say tomorrow.