Wow, I am very sorry to hear you have a FC like that. I'm with everybody else here... If you're honestly trying, and having trouble, you should receive some aid/tips. My FC helped me initially when I was having trouble. Here's what I learned/was taught:
Usually when I am tanking, I begin with a Rampart/Fight or Flight > Shield Lob > Flash > Flash > Halone Combo > Flash with a Spirits Within inserted whenever off CD. From there, I Halone combo, while tossing out an occasional Flash and cycling targets to verify enmity build-up and not lose it. 90% of the time this has worked for me (after I was taught), and I've never had anybody call me a bad tank or anything of the sort.

I hope this helped. And best of luck to ya out there. =)