If you have your heart set on something, it's hard to just forget it. Sometimes though, the thought of something is better than the actual job you're thinking about. If you really want to pursue this, get trained as a welder or rigger. Get some construction experience and see if you want to take it to the next step. Once you get a commercial ticket you will be an experienced welder/rigger who can dive, rather than a diver who can't do the job he's paid for. Just a thought... 

...Although I am still a bit reluctant to give up my wish, but i know i got to be realistic..
I got to wake up and look for other alternatives.. with good pay and fun (maybe)?
I got to really think through / seriously consider every facts that I am having now.
Thanks again.
KC