I was outside swimming, but also learn how not to sulk, I get all the water the water into my nose, I didn't inhale!
Hello, swimming is the most important two points to breathe and relax, excessive tension will oppress your nerves, so that your muscles become rigid, oppression of your heart and lungs, and thus hinder your breathing
Make you feel hard to breathe, stiff, as you described, probably because of internal pressure, swimming, the nose is used for gas, the mouth is used to breathe in the water, and all gas Tujin, then out of the water by mouth breathing.
Here is your following advice: 1, to the more formal place to practice.2, beginners, you can bring a few friends to go, have taken care of.3, practice as much as possible on the edge of the pool. If something happens, the lifeguard will help you in time4, if you have certain financial ability, you can ask a professional coach or a trained team member to teach