I've been using the apartment's workout room for losing weight. I've done a few youtube searches on some of these styles, and a friend says Aikido might be one of the best choices for me, or some of the other choices listed here.
Well. then I'd suggest that you'd at the very least try Aikido.
It really is nicely balanced martial art, with physical as well as philosophical aspects. It is not for everyone, though, and I do not mean that not everyone is up to it, but rather that not everyone is satisfied with it. Still, you need to make it clear to yourself, if you want to learn how to fight, or if you want to study martial art.
Many martial artists would like to compete at some time, like in Judo or Karate, but with Aikido philosophy, this is quite impossible. The Aikido techniques are QUITE valid, but the fundamental thought behind them is different from many other martial arts. A person who knows Aikido can defend himself, but it is not the way they are trained.
That is difficult for some. Each year, when beginner's classes are brought up, it is usual that only few continue to practice after a year. Even fewever continue forwards.. And this has absolutely NOTHING to do with the training.. Many just drop out for the lack of competition.. I myself have found that for me, this is the way to go. I might not be the best one, but it is mine for now.
You probably have seen Steven Seagal on some movies? He is fouth (IIFC) Dan black belt on Aikido, and while his technicues seem like hollywood magic, they are QUITE valid, working techniques that you need to study for years...
After a lifetime, who knows, another art may come to mind. I am fortunate in the fact that I can study other arts as well, even in my own dojo. The teachers do not mind, but rather encourage it.
Still, try it, and after a year or so, you might be surprised...