Just stick with it! We are of a similar size and I too have a great girlfriend. I always had the same feeling of insecurity about myself, but just believe her when she tells you that she is satisfied she really means it. Do the PE for yourself and no one else. Once you accept that you are doing PE for yourself it gets easier, at least it did for me. Just get into a good routine and stay consistent!
BPEL - 5 5/8" --- Goal 6"
MSEG - 4.5 " ---- Goal 4.75 "