I think it's a good idea to have a personal web site. If someone wants to find out more about you, they have a chance of hearing your side of the story: what's interesting to you, what you've shared with the world, and so on. If you only post on Facebook, Twitter, etc., then when those sites disappear or change their terms of service your information doesn't disappear. Do you want those companies in complete control of what others learn about you, or do you want to have some control? There are many former powerhouses of social interaction that have since disappeared, including MySpace, AOL, Google+. But if you own your own web site, you decide if it will remain available, not someone else, and what it will say.
You don't need to be "interesting". Everyone is probably interesting to someone anyway, and I think that's the wrong thing to strive for. Instead, think of things that you could share that might be useful to someone else, and share them. If you've helped someone else, then you've provided value to the world, and that's all anyone can ask for.
There's no requirement that you keep everything "up to date". Put a date on what you release, modify it if you update, and that's that. If it was released 20 years ago, it'll make the time clear. And really old stuff can still be really useful.
I just Googled myself, and my home page returns the top rank to me. Sure, it might not to others, but clearly it's possible to be easily findable even with a somewhat common name.
Regarding "enough interesting content"... you don't need to have a lot of interesting content. Post at least one thing that you believe helps at least one other person. Now your site has value to someone else. To me, that's enough.