Idk what to do anymore

Hey everybody, I’m 5’4 and 141-142 pounds (fluctuates based on how much salt I eat). In January I was 152, so I’ve lost 10 pounds which is awesome. For the past month or so though I’ve stayed at 141-142. I count calories/weigh my food and have stayed at 1200 or under this entire time (with the exception of my birthday). I also try to drink 64 oz of water each day but am not the greatest with that. I do have a pretty severe iron/b12 deficiency and take supplements, but am no where near fully fixing.

In terms of working out, I can’t. I’m terrified to go to a gym or class alone, the area I live in is warm and majority of people are either skinny pilates girls or jacked dudes. I have not worked out consistently in years and am relatively terrible at anything fitness related. I don’t know what I’m doing in a gym and embarrass myself in gyms/classes. I am also scared to walk or bike outside due to stares for being big for my area or being too slow/being in the way. The most walking I’ve done recently is going through all of the aisles at costco. My partner is a total gym rat, but doesn’t want to bring me because 1) that’s his chill time and 2) he’s there for much longer than I would be. I don’t have a friend or anyone to go with. Any ideas on how to lose the weight? Apparently a calorie deficit isn’t enough