I'm going to break up with my bf after he sent me a really heartfelt poem
Why are you choosing to break up with him after he sent the poem?
Because his poetry is too corny for my taste
Corny poetry is a petty reason to break up with someone.  You know, it is okay to not want to be in a realtionship.
What nobody gets it and everyone keeps pushing me to get back in the relationship. I just need time for myself.
If you are unhappy in your relationship, then it may be a good idea for you both to have some space. However, you should not blame his poetry as a reason for ending things.