I have had many students do exactly what you did when I have been a divemaster. The solution was usually one on one time with the instructor or divemaster. 

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I too had some troubles completing my OW certification - everyone else seemed to get it, be relaxed and having a great time. I was anxious, scared intimidated... I needed a little more one on one time and reassurance so I ended up finishing up my open water skills, etc. in a private class - extra cost but now I am an Advanced Diver with over 100 dives in less than 3 years and enjoy it very much. The extra / private help really was great! **Also - I had a male instructor first and finished with female - I think this was better too. As a woman she was more understanding and patient - plus she had a lot of girlie tips that the male instructors don't know / think of.
I had a freak out on my first checkout dive at the dive park! Got down with my group, and noticed my fin had blown into three pieces, as the group swam away my anxiety skyrocketed, and two seconds later so did I! I think the combo of the hood and 7 mil, and a malfunction and it was over! : ) I look back now and have to smile, I love diving SO. Ca. and all it has to offer. My recommendation, (and What I did) is don't wait long (I was back in two hours later) get an instructor who you can tell and have them watch your eyes the whole way down, its very comforting! If you have a few weeks wear your 7 mill and hood and go swim in the surf, with someone who's a good swimmer and just get comfy with the confined feeling. Another thing is get a one on one, just you and the instructor! Again couldn't be happier I got back in the water that day, I dive weekly, and can't imagine my life today without it!
And to everyone that says go somewhere warm, I say the opposite, If this is where you live learn to dive here, then when you travel you'll appreciate it more for learning how to dive what some would say is a challenging area (its really not) So. Ca. has beautiful dive sites, and Drysuits are a great addition to staying comfortable
I have taught MANY students right at Casino Point. Most do very well once we get to Catalina because we take the time to make sure all skills are solid and everyone's comfort level is ocean ready. Some, for whatever reason, have some troubles. It's not a big deal at all. Different people learn different skills at different rates. I have witnessed many students who just don't do well in larger group classes, do VERY well when they do private classes. This is the reason I chose to teach only private and VERY small group classes. If you have the opportunity to have some one-on-one time with a qualified instructor, it may do you a lot of good.
As for a referral to Cozumel, my very humble opinion is no. I LOVE Cozumel and I am 51 days away from being there, but learning where it is easy is not always best. It could make it all that much harder to dive elsewhere, even if you are certified. Remember, it's not about passing the skills. It's about learning to be a safe, confident and happy diver. Learning where you have a lower visibility, more thermal protection, more weight, etc, will make you a super diver in warm water places like Cozumel and a confident diver right here at home.![]()
A 7 m only feels bulky at first. Once you are comfortably dialed in you don't notice the neoprene and weight. You are not moving much anyway. Just floating along looking at stuff.
Did 4 shore dives out of Vancouver in a 14/10. Felt great in the 46 degree water.