For a long time, I was terrified of becoming an adult because then I'd have to make these decisions and permanently lock myself into this or that crap job in corporate America and start worrying about IRAs and mortages and whatnot.
My current solution is to be a TESOL teacher--that means I travel from country to country teaching my native language. If you don't mind living out of a suitcase, this is fairly ideal--you can stay as long as you want if something captures your interest, or leave if you get tired of it. It leaves me time for other activities, like traveling, writing, and online forums. You can't really get anywhere in life, but you have the freedom to switch careers, too, and have a diversity of experience to offer after several years of this.
I think the key for 7s is that it's OK experiment around. You shouldn't force
yourself into any one thing, or you'll start getting fears of missing out or wondering if you should have done X instead. The idea is to let a natural progression happen--go deeply into your interests and let your life unfold its own fascinating story. You don't have to stick with just one thing.