If you want to get fit but are afraid, why not try jogging?
I used to go jogging with my Dad for about once a week a few years ago, I even entered some fun run competitions. I found this easy to do as my Dad would register me & get me through the stuff, then I would just go and hide in between all the other runners and get lost in the crowd hehe!
I always used to run on my own!
I used to enjoy this even though Im terribly shy!
But I gave that up when I got a belly LOL. Although everyone used to wear shorts, I always worse jogging bottoms, but now I cant even do that, Im terribly unfit these days and self conscious of my big belly as people keep asking me if Im pregnant! Its all those years of self indulging in front of the telly when my shyness makes things worser!