Can retract when flaccid. Bunching of the foreskin

 I have a somewhat tight foreskin, i'm able to retract it easily when not erect, but it kind of bunches up behind the glans and does not roll back by itself, I have to roll it back in place although this is not uncomfortable or difficult (not sure if this is normal?). 
When erect it does not roll back over the glans 'automatically', I can fully retract it but it isn't very comfortable. It retracts maybe half a cm over the glans without me pulling it back myself. There are some pictures below to show what I mean. 
I've had sex without too much issue, although am always quite embarrassed by it. Any advice would be really appreciated, should I be doing stretching exercises, is my foreskin unusually tight? 
Thanks in advance.

Editor Notes: Not a severe case.  But seems to be putting a lot of pressure on the shaft of the penis.  It is my advice that you should reduce masturbation and when you do dont put too much pressure on the penis.

Source: http://www.network54.com/Forum/244184/thread/1398390225/last-1398441020/Do+I+have+Phimosis-+%28Pics+included%29