Hi HeroKiller -
Turning thirty is NO big deal. I did that back in 1987. 40 was no problem, either. In another few years, though, I'll be 50. Now, If I'm STILL single then, it Might be depressing, but I'm not giving up hope..50 is still young, at Least compared to say, 80.
I guess It's all realtive...30 must seem old to you because it is the oldest You have ever been.
Relax... You still have a Lot of good years ahead of you! :)