I think 'crazy' is a derogatory word and you probably shouldn't be calling anyone, including yourself, 'crazy'.
Mental illness can be roughly divided into two types: 1) organic--that is, illnesses that seem to have a clear physical or biological cause, and 2) adjustment disorders--illnesses that are the result of maladaptive coping skills.
If you have an organic mental illness, you might not know you are sick, but in some cases you will know but won't be able to sort out what to do about it. Schizophrenia is a good example of an organic mental illness.
If you have an adjustment disorder, you probably realize you have a problem but may be afraid to seek help because of the social stigma attached to having a mental illness.
About half of all Americans will have to deal with a mental illness at some point in life--usually a depressive disorder or an anxiety disorder. Anxiety disorders are far and away the most common mental illnesses in the US and most under-treated. But does having one of these problems make you 'crazy'?
No. It just makes you a human being.
There are also a wide variety of anomalous experiences that many people have that are not associated with any mental illness but which provoke other people who are uncomfortable with these strange experiences to use the word 'crazy when talking about them. That reaction is kind of the problem of the person using the word, not the person having the experience.