I've been on both sides of this fence; tattooed as a very large person and tattooed at what "society" deems an average weight. Over the last five years I dropped about 100lbs. Not because I cared what people thought, being visibly tattooed and covered in skulls got me used to being judged. I got bad news and a stern warning from the doc that my single handed quest to keep the local microbrew industry profitable would result in my early departure from this planet. I was 275 at 5'10; not a result of lifting weights or the like but from drive thrus and numerous beers. And I thouroghly enjoyed every minute of it.
The media tells us what we should look like, especially for women. The pressure on young girls is sickening. Society sees us at face value only; very few go beyond the initial observation, but true friends and family will know the person not the packaging.
Get tattooed no matter what size you are. Wear them proud and own it. Being comfortable with yourself and not caring how those who don't know you look at you is one of the most freeing feelings there is.