A lot of tanks struggle with confidence, especially when moving up to a new level. I agree that going with at least one friend is best, the whole group tends to be friendlier and more forgiving. I agree that HoT's can be easier to tank than the release heroics, and will allow you to gear up much faster.
A couple minor things with your gear, rather than straight parry for your red sockets, use mastery/parry (fine ember topaz), if the socket bonus is worth not using straight mastery. They're cheaper than reds, to. You're missing a few enchants, if you can't afford the high-end ones, there are some cheapie alternatives that'll help a bit (ie. pyrium weapon chain/shield spike). Start on Therazane rep, and in the meantime, you can use an armor kit on your shoulders. http://us.battle.net/wow/en/forum/topic/1020823291
has a ton of info on pally gearing/rotation/spec/etc.
Even if they're right and you *aren't* great at tanking yet, you have a great attitude. With more gear and more experience, you'll improve as you go. ;) This is my first tank toon, so I know I'm not as polished, fast, or confident as tanks who've been doing this for years. I'm gearing up really fast, considering I've only been 85 about a week, but it still needs a lot of work.