Beautiful soul, I'm going to make a claim that sounds outrageous and is absolutely true: if you could master only ONE yogic practice for the rest of your life - one single practice to regulate your nervous system, clear your energy channels, dissolve stored karma, prepare for meditation , manage anxiety, heal your body, balance your emotions, and create the conditions for genuine spiritual awakening - the practice I would choose for you is **Pranayama**.
Not asana. Not meditation. Not mantra. Pranayama - the yogic science of breath.
Because the breath is the one physiological function that operates at the intersection of the voluntary and involuntary nervous systems.
You can breathe consciously - choosing the rate, the depth, the rhythm, the ratio of inhale to exhale.