Clearly your repeated desire to drink and enjoy human blood is not normal. At best it is an addiction, at worst it is a pointer to some deeper, more pervasive illness. More details would help me in making a more informed assessment.
I completely agree with the advice of my colleague, though for different reasons. Irrespective of whether or not this is acceptable in society, you need help for your own sake because it is causing you distress. Also, you are exposing yourself to the potential of acquiring blood-borne diseases (e.g., if you have a cut in your lips or mouth).
So please try to obtain help from a psychiatrist
. You will benefit from both medicines and psychotherapy
Dr. Saifuddin Kharawala