I just have to say, you have done super fantastic so far!!!!
Some people say to "wiggle" your diet a bit, if you reach a plateau, by eating more than you normally would for two days, then eating less for two days. I don't know if this works, as I haven't had to do that yet, but a couple of my friends have and they said it helps get the weight loss back on track. Also, perhaps try adding in a 30 min walk, or additional exercise if you don't do a lot.
And it's not superficial at all to want to feel confident in those clothes!! I have a pair of jeans I am determined to get into, simply because I liked how my bottom looked in them =P You want to be able to show your family how awesome your weight loss has been, and I would think of that as more motivation than anything else
You can do it!!!!
PS: *wave* to fellow east coaster!!!! I live about 90 minutes outside of philly....its gonna be a hot summer!!