As an author, its very easy to take bad reviews to heart. They dig inside you like a cancer, and destroy creativity. You start doubting your ability to express yourself and your characters. A bad review can close you off to the world. The reality is that every author has received a bad review. In fact, some of the most acclaimed writers have received scathing reviews.
Here are a few:
Lord of the Flies
"an absurd and uninteresting fantasy which was rubbish and dull."
The Great Gatsby
"This is a book of the season only"
No one will ever receive 100% praise for their work. You will always have critics. What you need to decide is whether taking that next step is worth it. Do you really want a career as a writer? If the answer is yes, than the only one inhibiting you from realizing your dream is yourself. From this point forward, you take every review, find the worth in it, and become that much better.