It is a new age for women and I really think we need to evolve mentally away from feeling the need to get married. It's a great thing, sure, but the divorce rate is so high so not to be negative, but by not marrying you may just be saving yourself some later intense heartache. Look at the positives. If someone special that you REALLY click with comes along, you're available to them and open to have fun. If you were married and met someone special, too bad. You can date and meet many great people but when you're married, you pretty much can't be going out to places with other men, obviously. There's no worry about cheating spouses, who gets what in the case of divorce, no fighting, etc. Even if you meet someone special, which I am sure you will because 30 is definitely not too old to be meeting the love of your life, you don't necessarily have to marry them. You can be committed in that way but in the case of disagreement or unhappiness, you can easily walk away and perhaps be cordial with each other instead of fighting through a divorce. I know it probably gets lonely and you may feel unwanted but you must understand you're a brilliant woman that any man would be lucky to have but you don't need one to complete you. By being independent and confident in this way, it will draw men to you. Although it may hurt not to have someone right now, don't let yourself get desperate in the search of a husband, this will turn men off of you quickly. You're still very young. As they say, 30 is the new 20. You're at a good age for dating so have some fun and if the catch of a lifetime comes along, fantastic. If he doesn't, enjoy being the independent you that gets to meet so many interesting people.
Like someone else said, look at Sex and the City. Those women are in their mid-thirties and still not married and they're living it up. I don't know but I'm sure you're not super glamorous like the TV show but it goes to show women and the age ranges for what you're supposed to be doing are being redefined. You're 30, flirty and thriving!