You're not cut out for this kind of work; and you don't have what it takes.  Have something to fall back on in case you don't get what you want.  Don't even bother thinking that the person who says that to you is right because they don't see the drive, the will, and the passion behind what you are doing.  It's a mindset that sets apart from everyone else out there.  Believing what negative verbiage someone has to say is a voyage to self destruction. 

Writing is my passion, and will always be...