I've been away all day and just got back to catch up on the thread--you guys are giving some FANTASTIC advice!
TL;DR -- Let go of fears and be bold; let yourself write; build your legacy through the ideas you express and the stories you create, even if they're not very good, because someone will think it super awesome one day!
Always, just keep writing. You don't have to feel like you're good at it; you don't have to feel passion for it every time you sit down at your writing-spot; you don't even have to write something publishable. Take all that pressure off yourself--let go of all your fears, because that's what these pressures really are. What matters is that you show up regularly and CREATE. The act of creation, I think, is what's important--why we all love to write so much. Sure, getting published is cool, but at least for me, it's the process of making something new that gives me joy.
It doesn't matter if it's good--it's yours, and it tells your story in a small way. It shows your journey. Becomes a part of your legacy. One day, your descendants (or even you) will look at what you've written and say, 'Man! It is SO COOL that [your name here] loved to write so much! I feel like I can get to know them through this stuff, and these ideas are awesome!' I don't think they'll care if it was good or not, because it connects them to you, and that's what matters.
If you don't write, though, they won't be able to get to know you that way. If you don't write, the world won't get to see how cool you are. And if you don't write, and you're a writer at heart, then the not-writing will eat away at you and make you feel worse. I've taken month-long breaks from writing before--and when I do, I feel like I'm going insane. I feel so much better, and less discombobulated, when I allow myself the freedom to imagine, to dream, and to write it down and see what happens!
... Um... I wasn't expecting this spiel to go on so long... But it's not all my ideas. The bit about fear and the bit about legacies came from presenters at LTUE the last couple days. Hopefully it's encouraging, because it's meant to be!