You'll be fine - inductions are only about 1/2 hour and just walk you through machines - and then you can just go on what you feel.
but if you want to go to exercise, and not really talk to anyone, then take an ipod with you. Then, you'll soon recognise people and smile and when you feel comfortable enough, can say Hi and have little chats.
Thanks, I know, I just need to stop being pathetic and take that first step. That's partly why I fancy going to the gym. I have run in the past, and whilst I loved it, it's fairly isolating, and hard to motivate myself to go out on my own. Going to the gym would force me be around people, even if I don't have to talk to them. I know once I get over the hurdle of starting, and then start getting an exercise buzz, I'll feel so much better.
No - you're not being pathetic. Do you know anyone else who goes?
Other thing that might motivate - if you're a runner - is sign up for a run in say a year's time - and then you'll feel you'll need to start exercise and motivating yourself - you'll have something to work towards.