I did that, why don't you believe me?

It happened again
Why people can not believe that I did my website File1.net on my own?
From scratch, in ASP and MySQL using my background in VB with some help from online tips and forums?
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Do I look like someone who can not do something like this?
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Just like few years ago when I did my first application, File Simple Shop
When I started to publish it for free, people would not trust me when I say that I did that on my own
The guy was, saying: "ha? no, you must be kidding."
I try to say, "honestly, I did that multi-language application by my self, with these hands"

Now, again, every time I mention that this website, I did it on my own (Well, may be with some additional libraries from here and there), but they don't believe me