Very confused

I was yelled at in Weeping City today :(
I've only done it twice. The first time went okay. I placed a meteor in the wrong spot, but it ended up being fine. And I died to haircut, and also the attack Ozma does where you have to not attack.

Second time went awful.
First, to start this all off, I walked off the edge in Ozma before the fight started. Everyone said it was fine and it happens to everyone, and so that was fine.

Then came meteors. First set of meteors I was targeted, and brought it to the right spot this time. Fight continued on as it should. Until the second set of meteors. I didn't see that I was targeted immediately, and so tried to move out of the way of the meteor, then I realized I was targeted and tried to move to a safe area, but all the ones around were taken. There were people from the other groups on the side areas, and the other meteor target from my group at the bottom. I had nowhere to go, and ended up blasting the entire group. A bunch died, I was scolded, and I felt really, really bad. I didn't know what to do in that situation! What was I supposed to do? I don't want to mess that up again.

And then, again, I died to Haircut.


So now I feel pretty awful and I'm scared to go back in again. I don't like to let my party down like that. I can do the first two bosses really well. I haven't died on Forgal or anything. And I can do all of Ozma fine except the meteors :(

Edit: Finally had success (for me) on the 5th run. By that, I mean I didn't die due to messing up mechanics. I did die twice, but that's because we actually wiped twice in Ozma, which made me giggle because of course we wipe the one time I actually do the mechanics right!
Anyway, yeah. First boss was as easy as it was the past times, and so was Forgal, although I did mess up and get zombified once at the start of the fight :(
Ozma went well for me. I did get meteors the first attempt and managed to place them correctly. The second two attempts I only got the first meteor and then didn't get the other sets, so that was pretty stress-free for me. First attempt we wiped after one of the other groups died, second time I don't even know why we wiped. It kind of happened too quick for me to really catch. Third time was fine.
And then a pretty perfect Calofisteri. I only got stuck in a trap once! And I didn't get hit by Haircut this time! And I think my group actually only had one death and that was Haircut-related and easy to fix. 
And I'm now at i230 so I can stop worrying about running it over and over and go do Baelsar's Wall like I wanted to do. Yay, now I can do this with less stress! I still want to keep doing it for the gear, but that's less stressful than doing it to unlock something else. 

Why?

Why is it, that when I'm playing Summoner in PoTD people for some reason expect me to heal them?

HOW WOULD I DO THAT? My heals do nothing. I mean, I can try to heal you, but if I just helped kill the monster it would probably die faster than I can heal you, so...?

I can revive as many people as needed, but I can't fill the healer roll as a Summoner, I'm sorry.

Edit: I have more.
Why would you wait at the Cairn of Passage when it's not activated yet? Whyyyy? It's a whole lot more helpful if you actually help activate it!

Also, that server move is currently messing me up. I keep hitting buttons and they don't activate in time and I keep being hit by mechanics I've never been hit by before. I'm sure I'll get used to it, but it does stink. I just hope I'm able to play Stormblood because my computer could barely handle the game before :|