Lefty's on the money.
Nothing wrong with starting small. I started as a kid with a 4'6" Daiwa UL combo for bank fishing, then added a MH action 5'6" Ugly Stick caster a couple years later and a Heavy action 5'6" Lightning Rod a few years after that. Caught tons of fish on those using every imaginable tactic of the day. Eventually got the tackle bug and a boat and discovered that I liked medium action 7's best for making long open water casts so I got a handful of those. Moved to kayaks and started fishing the salt and wanted a heavier action in the 7'ers. Now I'm thinking that 7'6" would be nice sometimes for the reasons lefty mentioned. But there have certainly been moments when I was trying to squeeze a cast from shore out through a hole the the brush and I wished I had a smaller, more nimble rod with me.
Another way to put it is that the length of this rod probably won't be the reason you stop fishing, and I can pretty well promise that if you do continue, then this rod won't be the last one you ever buy.
If it feels good to you then I say find a well-matched reel and get on with some fishing!
Looks like that Cardinal 102 is a good size match- 175yds of 6lb. Personally I'd put a backing layer of mono then fill it with 6-8lb diameter/20-30lb test braid on it and use a mono or floro leader when visibility is an issue, but that's me (I like to get my lures back and hate line twist).