> Bitcoin allows me to be my own bank.
I too, like to live dangerously. I run a mail server. A web server. Damn, I was tempted to (partially) host my DNS.
But running my own bank? Hell no. Those who ever had to touch things like PCI compliance or seem actual money transaction requirements will want to stay far, far away from being their own bank, so good luck there, you'll need it.
> It allows me to save my money outside of the global financial system
No, at this point in time, it really doesn't. It would, if it was accepted to be exchanged for things, which is any currency OR asset is, in theory, only good for. If you can't buy (exchange) food with it, it's worthless.
EDIT: yes, you can, in theory, exchange it to USD and some other real currencies - with a big 'if' the exchange you want to use has the means to cover it, you pay taxes on gain, and, if you're really lucky, your bank won't freeze your account when an unprecedented amount of cash flows in.
> Money is whatever people believe it to be.
Money is whatever people _agree_ on. It's not a belief.