welcome Blas. Ok so you maybe took the long road to get started. The important thing is actually starting. I never even heard of aikido until a year ago. And the last thing I ever wanted to do was take up a martial art at the time.... then it just kinda came along and here I am. If a 39 year old overweight woman with no history of anything like a martial art can get started so can you.
Be careful and train smart. Aikido is indeed a workout. I'm down 25 pounds since I started. If you wait until you are in exactly the ideal condition you will never be ready.. ol just train. Use your head. Don't do more than your body can handle and increase slowly as you are able. Most of all enjoy the ride.