Hello and welcome to the forum :)
First and foremost, no you are not crazy.
Obsessive Compulsive Disorder is an anxiety disorder characterized by persistent intrusive ideas, thoughts, impulses or images (obsessions) which often result in performing compulsive rituals over and over again. Typical compulsions are washing, checking and arranging things, and counting. These actions give individuals with OCD only temporary relief from their anxiety. With early diagnosis and the right treatment, people can avoid the suffering that comes with OCD.
We are not Dr's and therefore we cannot diagnose you with OCD, but it does sound to me like you are experiencing some of the classic symptoms. I suggest that you vist a Dr and get an actual diagnosis.
I can also assure you that nothing bad will happen if you do not check everything again and again. That is your OCD talking to you.
You came to the right place for support and answers. Feel free to ask, and again, you are not crazy. Don't ever think that.