Starting where you're at is a great place!
I joined several years ago but have become more active lately, my DD is 19 months and I need to get the last 5 of baby weight off! Like you, though, I've tried several times in the past to dip into the 150's with some stalling at about 162.
30 is a *fabulous* age to be! You're old enough to know a little, but young enough not to worry about 40, lol. (NO offense to anyone, just trying to be light...)
Make sure you celebrate!