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 ? 
Controlling our emotion is a step by step process. One can never immediately control his or her own emotion within a short period of time. Particularly if the environment or people that surrounds that person is not healthy. So, to control it better start from simple things such as watching movies, try to control your emotions about what you feel during the movie.