Whether or not you freaking out has to do with OCD, you need to change your mindset. It sounds like things got too tough and you're quitting. Now don't get me wrong, EVERYONE needs a break but there's a difference between a break and quitting. This very moment you're going through, is what every champion has had to overcome and will have to overcome over and over again. This is the difference between champions and everyone else. Look at the root of the problem. Ask yourself why you get so messed up from fighting 15-16 year olds. Hard work isn't fun. Success isn't always fun, especially in the beginning. You have to ask yourself, do you really want this or not and if the answer is yes, then follow through on it. I remember reading about how you wanted to be champion and the only thing that's changed since then is a little adversity.
Don't blame things like OCD because some the greatest people in history have had OCD. Beethoven, Einstein, Michelangelo, Tesla, and Howard Hughes just to name a few. I have OCD and I'm grateful everyday for it. It can be the driving force that pushes you forward or your worst enemy. Use it instead of letting it use you.
You need to also stop making excuses. If you're mad that the kid took you down, then get better at wrestling. If the takedown was so garbage, your defense must've been worse. If it's because he's stronger, then get stronger. If he's holding you down, then work on getting out of stalling positions. Adversity breeds innovation, so be grateful when you encounter problems because it gives you the opportunity to better yourself.
A reporter once asked Mohammed Ali how many sit-ups could he do. His reply?
"I don’t count my sit-ups. I only start counting when it starts hurting. When I feel pain, that’s when I start counting, because that’s when it really counts."