>>23283927>>23283985These anons have the right idea, and if you get nervous in the middle of a battle and it causes you to crack, get something like a stress ball to squeeze or just feel in your hand. It can really cause your anxiety to just melt away; take a few deep breaths, and then focus on the battle again as clearly as possible.
Just remember that if you're worried about losing, we all have to lose before we win. I'm a rather decent player but definitely not the best, but if you would have battled me when I first started, it was appalling how fuckawful I was. It wasn't uncommon for me to get swept 6-0 or 5-0
Practice, and battle more often. Hell, MAKE yourself click that button even if you don't want to. You'll get acclimated to the battling atmosphere, and in time you won't have anything to worry about. That's the only way for you to get over this.