You can do it TT!!

The benefits far far outweigh the negatives. I'm neither slim nor beautiful. I am there in my daggy T's and tights, but I'm there.
Like many PPs I go for the just after school drop off classes and it's mainly mums. I'm lucky my gym is owned by two mums and they are fantastic. I run the creche a morning a fortnight in exchange for no gym fees, so it works well for me.
Regarding that other lady. Hold yourself in higher esteem chick. YOU are worth going to the gym for because YOU want to. Who cares about her, we're all allowed to choose our own friends.