I'm also newbie in this business like you, after 50 images rejected. I still keep going on what I like and interested to do so.  I have not more than 20 images in my portfolio, but one days it will be 100,1000,10000 until 100000.  

No one will stop you, until you do it yourself.  Rejected is not a reason for stop doing thing, the only reason is your heart is too weak.

Keep your chin up my friend!, we gonna go through this together, many useful topic in this site are available for you to see and it completely help you in the future.