The great thing about martial arts is you can be at any fitness level and do great. That's because there's no rush or pressure to do anything quickly. You can learn at your own pace.
If you have a knack for it, you can speed through techniques. If it's a bit harder for you, take your time. All we care about is that you're having fun, learning and progressing, and staying safe.
The self-defense techniques you learn help you become flexible and strong. They help you become confident and proud.
The guiding principles of Martial Arts help you diffuse situations before violence becomes a part of them. However, if a hostile situation does ever come about, you'll have the tools you need to keep you and your loved ones safe.