Wow, my starting/current weight #'s are similar to yours, and I'm 30 too.
Sorry, a bit off topic!
I had the same problem a few weeks ago... I had a great week and weighed in to find I lost ONE pound. I was so disappointed that I wound up going off plan for a few days and gaining back.
What I've decided to do is weigh less often. I weighed on Monday and I'm not weighing again until July 1st. Then I may try to go a whole month without weighing, although I doubt I'll make it that long lol! My thinking is that, even if I continue to only lose a pound a week, seeing a four/five pound loss at the end of the month is much better than just the one at the end of a week. I know, I know, it's the same thing... but mentally it just helps me seeing that larger number.
Also, I don't know about you, but I used to be thin. Over three years I gained 70 pounds! I watched the scale go higher and higher and higher..... so now even if I've stayed the same weight for a while, with no loss, I remind myself that the # on the scale would be HIGHER if I'd been off plan. For example, I'm 170 now and I was 170 a month ago.
I kick myself thinking if I had done better, I'd be 165 or maybe even 160 by now. But then I think- I also could have easily GAINED 5 pounds (or more) over a month, and could easily be 175. But I'm not. Yay!
Anyway, I'm rambling. But my point is, focus on the good, remember you are still going in the RIGHT direction. And you never know when a big loss will surprise you! You may get on the scale next week and see a 3 pound loss. So keep going!