Yes you could learn on that board. But it would suck, and you wouldn't get many waves. The board would get dinged up from general use and by the time you are capable of riding it, it'll be thrashed. Such a pulled in tail means it could go good in barrels but will be a dog in anything else.
Don't get a longboard if your goal is to ride shortboard. Get something about that length but around 3" thick, and around 21" wide. Maybe a retro fish, with a semi-wide tail and not too much rocker. Try and get one with a lighting bolt

. One piece of advice: don't get rid of this board. You will grow into it.