There's an old saying: the saddest thing you can say is "I should've..."
The times when you run into the problem of being disappointed is when you have expectations. If you can get over expecting much of anything, then whatever happens is a good thing, in part because it's just so damned new.
I'd say it's up to whether or not you can just not expect too much. If you're willing to enter into it with a "let's see what's out there," and just have a bare minimum of things you predict are going to happen (like, "I'll meet X and Y," without trying to think about what's going to happen after that), then I think you should go. You'll travel someplace new, you'll see things you've not seen before, you're... are you going solo, or with a friend? Not with family, right? So that's always an adventure. Do a few touristy things, meet some people in the flesh that you haven't met before.
It sounds like it would be utterly awesome. But there's that overthinking. You predict and expect and fret about whether it's going to go right. Well, if there's no pre-set plan, then however it goes is "right," no matter what that is. You can hope the people you meet are going to be as nice in person as on the internet, but if you don't predicate anything on that being true, then they can be whatever. You can hit it off or not. It's all about what you go into it with.
Now, I know telling you not to develop expectations is like telling a fish it's got to ride a bicycle, but I think you can at least work on it. If you consciously work on trying to eliminate your expectations, that might be successful.
Don't let fear and worries about what might happen keep you from enjoying what could be a wonderful experience. Take steps to protect yourself if you must, but don't just write it off out of fear, hon.
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You'll be fine, you'll have a great time. Don't let yourself overthink yourself, m'dear.