Hello!
I am currently attempting to model a push pin, and I am a beginner at modeling. For some reason, the push pin is appearing deformed, or, well, I’m not really sure how to describe it… I posted some pictures below for you guys to look at. I am not sure what to do? Any help with this problem would be greatly appreciated. 
You have inconsistent face normals
In this order
Remove any faces inside the mesh (use Shift+Ctrl+Alt+M to check for non manifold edges)
Remove any double vertices (select all vertices and W / remove doubles)
Recalculate face normals (select all vertices and Ctrl+N)
Wow! Thank you so much! It worked! 
How could that have happened in the first place? Thanks for helping me, modeling is my weakness. XD
How could that have happened in the first place?
If you used spin to make your object you need to remove doubles afterwards at the seam.