Put on your ipod, turn it up as loud as you can and pretend you are the only person on the track.
Do not be embarrassed, you have to tell yourself this, or you are not going to get anywhere.
I let something like that hold me back once with exercise. (Not exercise for weightloss but for fitness).
I am a mother and try really hard to keep fit. However the comments I got by many perverts or the horns on cars that beeped as I jogged with my babies really started to bother me. Why should I not be entitled to jog along and be shown some respect.
So I started wearing sunglasses when I exercised and made sure my music was as loud as it could go so I could block them out. Some people can be rude for all sorts of reasons. Don't let it stop you, block them out.
Good luck