Stealing liquor

So I'm a 17 year old girl and I've taken wine a few times from Walmart and Kroger, and I wonder how easy it would be to steal vodka from local liquor stores. I could avoid suspicion because I could pull off looking 21 for sure, but how risky would that be? And would concealing the little sampler bottles be easier than a whole bottle in my purse? There's an abundance of liquor stores in my area so I would have no problem just not going back to any particular one as well.