When I first started gym I was about 22 I think. I was self concious but soon realized that everyone else is too busy checking themselves out to be worried about everyone else if anything they will think good on you for joining! I haven't been to gym for 5 years now as I quit and bought a full home gym set up. But I miss the social aspect so I am joining one again next year. You will be surprised at how much you will get out of it. Im excited for you re your old friend, ask the people there if she's a member.