Learning martial arts..... without risking head injury

Hey everyone.

I (32m) have always wanted to learn martial arts, and for the first time I've got plenty of money, free time and no obligations.

Mostly I want to do it to improve my body. Especially my flexibility, balance and coordination. Also hoping it will improve my confidence, making me less anxious and more assertive. And yes, maybe good for self defence if running away or de-escalation are not possible.

However, i have sustained many head injuries in my youth due to a rough family situation. Last one was around 14 years ago.

Is it safe for me to learn martial arts? And if so, which ones would you recommend for my above goals?

Alternatively I could pursue other activities like Yoga, swimming and Weightlifting.

Thank you in advance for your wisdom!!