Paul,
I'm German and live in London. Your problem seems pretty obvious: you don't escalate sexually and therefore you get friendzoned. Its what I did most of my life. But there are good videos and articles out there to help you. Check out the guys from Maennlichkeit Staerken on youtube. I'll also be doing a seminar in London about how to avoid the friendzone, etc. With a few twists I am sure you can make it quite far.