Should I go with fish at this stage?

I started off with a softtop 1.5 years ago. After a few months I changed to minimals (I tried a few dimension to test which one suits me better) I found out a minimal was a bit beyond my paddling ability ( My arms get tired fairly easy) and I caught fewer waves with them. So then I changed to a 9.0 food full size BIC longboard and liked it. It is easier to paddle and more stable. After another few months using it and catching some good waves/turning it, I thought I was able to handle a minimal and I gave it another try this weekend. But I was exhausted already after a one hour session paddling it( probably due to a not-so-ideal surf condition) and I miss my longboard immediately.
My instructor told me in order to build up enough paddling fitness I need to surf regularly ( at least twice a week for 6-8 weeks) which is not that practical as I have work commitment.( I surf once a week currently) she then recommended this fish board to me and said it will be easier because its width and thickness.
Another instructor said I was already in the lower end of intermediate level ( not sure if he only said that to me happy) and he said I can change to a minimal ( which I tried this weekend)
So should I stick to my longboard for a few more months( don't want to do this because it is soooo heavy to carry around) and I am afraid if I do this I will stay with it forever. or should I try harder with my minimal until I can eventually handle it, or try this fat, thick fish my surfing instructor recommended?
I am nearly 30 years old so I so of cannot afford wasting time on boards I should not be with.(Basically I just need a board easier to paddle and lighter)
Any comments/suggestions appreciated.
My instructor told me in order to build up enough paddling fitness I need to surf regularly ( at least twice a week for 6-8 weeks) which is not that practical as I have work commitment.( I surf once a week currently) she then recommended this fish board to me and said it will be easier because its width and thickness.
Another instructor said I was already in the lower end of intermediate level ( not sure if he only said that to me happy) and he said I can change to a minimal ( which I tried this weekend)
So should I stick to my longboard for a few more months( don't want to do this because it is soooo heavy to carry around) and I am afraid if I do this I will stay with it forever. or should I try harder with my minimal until I can eventually handle it, or try this fat, thick fish my surfing instructor recommended?
I am nearly 30 years old so I so of cannot afford wasting time on boards I should not be with.(Basically I just need a board easier to paddle and lighter)
Any comments/suggestions appreciated.
