Might as well try it. People here were never going to help much tbh. If I found out that a guy I was seeing had done something to enlarge his penis, I wouldn't care as long as the thing was natural, it wasn't going to suddenly wear off after I've gone and gotten used to his body, he wasn't penis obsessed and as long as he knew how to use his tools. If that makes me weird, so be it.
**** I feel sorry for you bruv, mine is 5.5" normal and 8" erect.
If you want a larger penis I say try it but really 6" is big enough, girls don't like it too big. However these exercises will make your penis longer but also thinner, which is a lot worse than just smaller (women prefer girth to length). It can also cause problems with blood vessels etc. but if it is really impacting your life then go for it but personally I'd leave it.