I definitely can relate to this feeling as well! Im sure most people here can!
Some days I dont want to leave the house because im ashamed of what i see in the mirror, i also look hideous in gym clothes and cant afford to buy some new ones
But most of the time i dont care because it makes me feel better and where I walk, everyone is just minding their own business and exercising as well (however most of them run... I walk...
I just tell myself, I dont know these ppl, they dont know me and im never going to see them again.
I find it better to exercise where there are a lot of people doing the same thing so you just blend in. The other day I took a different route and ended up in the cbd where everyone was dressed nicely in suits and heels, i felt so stupid and out of place. Much better on the walking track where everyone is doing exercise
Hope you can encourage yourself to get out there!