Hi Peaches, and welcome to the "club" hehe.
Gyms are scary. I hate going by myself...I think that's why my $180 3 month membership went down the loo *shrugs*. But before I started, I was told that just by stepping through the door, you're making a change. The people on the inside would be proud of you, no matter your size, just for deciding to do something...
But each to her own, as I say. Laps of the back yard seems like a good alternative though...pity I can't GET to the back fence of my yard...silly trees.
Good luck with your journey though.
. . . when the rich wage war . . . it's the poor who die . . .