Learning it through experience and you would be the only one to find out for yourself on how you would able to control off your emotions because fear is

something always been part on a human being and its just really normal for us to have those kind of reactions specially when we are still a noob
but as long you do go further and make out trading involvement then you would slowly get rid of that.

When you do have sufficient experience,skills,awareness and knowledge then you would able to handle it out.