actually i like when guys walk in front of me.
here in germany i usually have to turn a lot to find my boyfriend somewhere in the crowd because i prefer to walk fast^^'
and sometimes it's kinda embarrassing when they open the doors, take your jackets and bags...

i think it is a matter of taste.

Japanese guys are great friends! they are so much fun and very caring BUT!!
as a boyfriend... I swear they suck... or maybe coz I'm an affectionate person My bf is japanese and he used to be my really close friend and we had so much fun together! as friends! I cant read his true feelings for me.. now that he became my boyfriend, its a totally different story! He communicates less and he doesnt tell me much stories about him anymore -_-, Its like we were closer when we were just friends... its terrible.. he prioritizes his friends and his gadgets over me and he doesnt wanna tell the world im his girlfriend killing me softly... its sad but I love him... but its super hard for me..I feel neglected

Japanese guys vary from place to place. In Tokyo you can find modern men that will have more in common (relationship wise) to western men because of the tourism and diversity in Tokyo. Westerners tour there all the time and they bring their culture with them, this is why you will see less traditional relationships there. In more rural areas though, many people tend to follow "tradition" so men are less into dating foreigners and treat their women more "traditionally" aka with less respect. So if you are looking to date a Japanese man look in big cities because they will be more accustomed to the western traditions and behavior.

Western tourists influence the relationship style of Japanese?

No, sorry.
Not in the slightest.