When I was 17 years old I took refuge with the Triple Jewel. Now, I wish to leave the home life, not for the sake of ending birth and death and getting out of the Wheel. I only wish to become a left-home person: bald-headed and in particular, having the honor of wearing the yellow robe of liberation. This is because every time I went to recite sutras at the temple, and I saw the monks and nuns with their yellow robes and sashes in the Buddha Hall, it filled me with the utmost respect and admiration. And I often wished that someday I too would be able to don the yellow robe!
To be born into a family of many generations of Buddhists is indeed to be very blessed.
Allow me to defer talking about my personal reasons for leaving the home life to another time and place.
Your mother is right: you should perhaps get a better idea about the home life before you jump in head-first. Ask for permission to come and stay at the temple where you wish to live to get a feel of the environment.
Your small tattoo should not be a problem at all. If any monk or nun objects to it, then he or she probably is not the one for you to follow anyway.
Your family is very blessed. You should use them as a proving ground of your sincerity. It is better to leave the home life on good terms with your family. Unless your enlightened Master approves otherwise, it is always better to obtain your parents’ permission.