is perfectly normal and only those people worry about it who develop unnecessary guilt along with it.There is no need to worry about it.
Penis has normal slight curve and is perfectly normal.
There is no way to increase the size the size of penis and there is no need to increase it.
Whatever size of penis you have is sufficient to derive and give adequate sexual pleasure.
It is better to come out of this flawed myths and notions about penis and masturbation.
Don't do the masturbation just for the heck of it.
Do it whenever you are sexually aroused naturally.
Although doing masturbation daily is not harmful medically but still you must indulge in regular exercises and yoga
and concentrate in your career rather than thinking of penis and masturbation.
Thanks and best of luck.