Been there, done that, got the t-shirt.
First off, don't ever call yourself disgusting just because you happen to be overweight. Honey, I'm a size 16 these days myself, which is considerably smaller than the size 24-30+ I was wearing back when I was dating. I doubt you'd ever have the heart to call any of your friends or even a perfect stranger like me "disgusting" for being overweight, so why are you doing it to yourself?
Secondly, there are actually a lot of guys out there that will think you have plenty to offer even though you don't fit the impossibly high standards of so-called beauty. If this guy keeps talking to you online, it's because he's drawn to your personality and intelligence! It's most likely what he's attracted to, and any fear you've had about your appearance will fall into the background. He's already seen photos of you anyway, right? You're human! He's not expecting some plascticoid fantasy avatar or anything like that.
And third, trust your gut! Take precautions to make sure you're safe of course, step back to think with your head as well as your heart, and set clear boundaries with him
before you meet in person. Let him know what you want and expect, and what you will not tolerate.
The STD testing previously mentioned by others is not a bad idea either. Also be sure to let others in your life know where you plan on being and to check back if they don't hear from you by a certain time.
. . .
So where am I coming from here? To give a little background, some guy really liked one of the sketches I'd posted online and started talking to me in a chat room I hung out in. He eventually asked for my IM handle and we became best friends over the course of a year. I barely knew his real name and had seen only one teeny photo of him by the time I'd fallen in love. Sounds perfectly crazy to those outside the situation, and I really can't blame them. He felt the same way about me too, and when we talked on the phone for the first time the subject of marriage and kids were brought up. And we obviously hadn't even met yet!
He arranged to fly me out to meet him in person a few months later. Hotel room, vacation, the works. Some of my friends were supportive, but most were like, "OMG, what the h3ll are you getting yourself into, do you know how dangerous that is, how easy it is to lie about yourself online, blah blah blah?!" So yeah, I heard it all. And I decided to trust my gut.
Turned out to be a wonderful experience. In fact, the only real issue was being all worried about my weight . . . I was 285 pounds at the time, in a size 24/26. But all the worry was over nothing, as it didn't matter to this guy at all. He already loved me for my mind and the way we were connected; he told me over and over again that looks didn't matter and that he already found me beautiful and incredibly attractive, no matter what. When it was time to fly back home, I sobbed uncontrollably; it was like the fairy tale had ended. We kept in touch just like we had before as I worked to put my life in order. It took another six months before we got our own place and I moved across the country to be with him. Despite all the flack both he and I got from friends and family for diving into our relationship over such non-traditional means, we somehow knew exactly what we were getting into long before we met in person. We "met" online in late 2005, started LD-dating in 2006, met in person and moved in together in 2007, and got married in 2010.
I obviously can't guarantee what the future holds for you, but the very last thing you should be worried about is what he thinks of your weight. If it ends up being an issue with him, he's simply not worth it. The internet is a fascinating way to get to know someone; while it's true that people can lie about who they are more easily, I think it's also easier to bare our souls to each other, without the peskiness of visual stereotypes and other emotional baggage getting in the way.
Looking at the grand scheme of things, if you've found the love of your life no amount of weight is going to drive him away, and if it's just a fling, it's just a fling.
Just be aware of what you may be getting yourself into!
Good luck to you and keep in touch with us here. And once again, set clear boundaries with him beforehand and take steps to ensure your safety; that should really be your main priority here, not what size dress you can fit into.