Jelqing for a couple months is said to correct curves to the left or right on a penis using PE. Also maybe a type of erect bend could do it (but don’t mess with these types of PE excersizes unless you are really comfortable and have been PE’ing for a long time because you could possibly tear the tunica and make your dick end up looking worse if done wrong.). I also recently read that actually wearing something like tighty whighty underwear (not boxers, can;t remember the name I haven’t used them in ages) and being aware most of the time where your dick is positioned in your underwear by placing it in a certain position against your bend you can over a long period of time (a year or more) correct this problem.
I would personally do some more research here using the search button and get into jelqing but make sure you read a lot and then start practicing it with a good routine for a while.
One more thing that might help you is to hang or use a ADS device for most of every day (making sure you don’t overtrain your dick) with jelqing and this can possibly correct your curve as has been said many times from others. Look up the AutoEXT or another ADS like JES-Extender (there site tells of correctiing curves I beleive…) Good luck “crooked guy” ;) .