FINALLY met an amazing man and now I'm scared....what gives?

So I've hit the jackpot here, folks.

I have met the most amazing man. We've been seeing each other for a few weeks. He's good-looking, successful, building his own company, smart, funny, incredibly sweet, kind, thoughtful. Takes me out on dates and is extremely kind and attentive. Remembers everything I say (as opposed to me, Queen of the Crappy Memory). I feel very comfortable with him and we have a lot of fun together. We have tons of mutual interests and a lot to talk about. We have a lot of mutual friends, and they have good things to say about him. He's planning fun stuff for us to do together all the time, and is excited about the future. He told me several times he's "crazy about me," and this morning told me he "did not want to see anyone else but me" and asked me to be his girlfriend, which I accepted.

Things are moving along a little more rapidly than I am used to, and I'm happy about it. But at the same time, I feel apprehensive and kind of freaked out.

After a big breakup of a 4-year relationship a year and three months ago, I jumped right into the busy LA dating scene. I did the math and I would estimate I've been out with nearly 20-30 different guys and on nearly 100 dates (many of them 1st dates, but many of them also subsequent dates with the same guy).

The vast majority of these guys were total bums and dating has been tiring and arduous to say the least. I have become quite accustomed to being strung along and lied to, and feeling frustration, disappointment and pain. I was planning on just giving up for awhile to give myself a break. Then I met this new guy out of the blue and everything is different.

I've finally found the one guy in LA who isn't a douchebag. He adores me and compliments me endlessly. Yet now rather than rejoicing, I feel scared. He's what I've always wanted...and he's nuts about me...and I him...and I just feel kind of numb.

I'm mad at myself for feeling this way. Shouldn't I be overjoyed that I found this amazing guy I've been waiting for? Instead I just feel overwhelmed and hesitant, even though I'm nuts about him as well. It's almost like I'm not letting myself feel anything so as not to be disappointed if he ends up being an ax murderer.

I also think it might partly be a bit of a commitment-phobia that I have. I have realized that I have tended to go for guys that I know in my heart-of-hearts would be inappropriate partners, so I could have a built-in escape mechanism. And I'll be crazy about them, just lust after them like crazy, knowing full well that it won't end well. I ended two very long term relationships that I let go on too long--too long because I knew it wouldn't end in marriage. So I just kept dating them endlessly without pressing a more permanent commitment from them, knowing I wouldn't be with them forever. No forever = no fear.

Usually there's some huge red flag with most guys I start dating, where I know that it will never last. It leaves me free to lust after them--this "knowing it won't last." But there's no red flags with this guy. There's nothing to "fix." There's no reason why he and I would not be perfect together. The first thing I thought when I first started dating this guy was "I would be surprised if we are not married in a year." I can see all the stages of life with this guy...I can see us getting married and having kids and the whole nine yards...I never saw this with anyone before.

And I have what I can only describe as a panic attack when I think about it.

And it scares me to the point where I almost want to call him and tell him I can't be his girlfriend.

Which would be totally stupid because this guy's a total catch.

Does anyone else go through this? How can I stop sabotaging myself? I don't like feeling this way. I want to feel happy and celebratory rather than sad and anxious. Am I just so used to disappointment that I can't show gratitude when something good comes my way? I don't want to be some ungrateful brat. But that's just what I feel like. I know a lot of women (including myself in the past) would kill to meet a guy like I have now.

Advice please, on how to stop sabotaging myself!!