This likely will come across as pedantic, but...
It would depend on the context of the word because it can have different meanings. Legend, when referring to a person, means somebody who is highly revered for doing something that others consider a great deed, it is synonymous with "hero". Individuals who are viewed as legendary can actually be real - such as an historic warrior. In this sense I am absolutely not a "legend". I have been (and still am) a social reject for most of my life, and whose presence is hardly acknowledged or appreciated. Not just this, but I have not done anything that would warrant being called that.
On the other hand the word legend can also mean a story, event or person that is either partially or completely fictional - like a myth or a fairytale. In this context then yes I am a legend, because I am made up and do not exist. It certainly feels that way.