Is it bad that I'm 18 and still have no idea what career I want?

So I had a bad childhood(I won't give you the sob story) and thought I was going to fail school but in the last year of school I pulled myself together, did my exams and actually came out with some decent grades. But since leaving school I have tried a few different college courses and can't seem to find anything that I want to study or go into as a career, I feel stuck because everyone else in my school year are going off to uni in September and I'm still unsure about what I want to do. Everyone in my family are saying I've failed at life and that I'll never get a decent job. I really want a good career but I want to do something I enjoy. Any thoughts? Experiences?