Maybe get yourself a couple kettlebells and do some kb swings at home? You can build a lot of baseline strength with a kb or two. Even just doing 100 single arm swings per day is enough at the beginning, and it takes no more than 15 minutes or so. Set yourself a goal of doing it consistently for a while and I'm sure you'll feel pretty confident walking into a gym again after 45 or 100 days.

Rogue is actually doing a 5-items ship for $5 promo for the month, kettlebells included.