I am starting trading some month ago.Bought some alta coin but now all alta coin are down and i donot understad what can i do?I get a big lose if i sell this.So how control my mind ? 
Accept the consequence that investing has many risks. Especially when it comes to its return. May be you need more time to do some meditation. Dont overthink about that.mthere are many things to be happy And it's not the end of the world yet. Majority of alts are currently down right now because of bitcoin's bullish run. If you've bought some decent coins there i think you just have to wait. Don't panic and just hold on to those coins as they eventually will recover