What Ace-the-Artist said are some really good pointers and I too am going to utilize that opening line in the field as well.
I suggest reading some books on Pick Up Artistry and watching some videos and then testing some techniques and openers out in the field. There is a lot of good material out there. The Mystery Method and "The Game" by Neil Strauss are good places to start and are really awesome. I suggest reading "The Game" first because it is a quick and easy and opens the window of opportunity to explore the various methodologies (systems of pick-up) that are out there so that you will find what works for you. The more social you are and the more conversations you have in the field= higher certainty and confidence. There are many quick videos you can watch also; I suggest checking out the videos by "Gambler"; he has a lot of quality stuff on Youtube. Remember to "field test" what you learn from these systems i.e. put them to practice in a social setting and see how it works. After some practice and time you will know what works for you and what doesn't.
First: Examine your purpose for doing this in the first place i.e. what is it you want out of the Pick-Up scene and PUA. You want to have a goal and know the reason you are doing this.
Second: Its about transition and applying your knowledge by practicing it in the field. You will begin to experience a transformation. Get out of that shell and grow as a human being. In life people like those that are congruent and certain of what they want. Life is about changes and development; those that don't change fall behind in their own life by getting too comfortable and miss out on a lot of great experiences. Its not just about confidence but about being comfortable communicating, touching and sharing your "interesting" life experiences with others.
Third: Don't over-analyse and over do things. Practice to perfection and be as natural as possible when utilizing PUA techniques. When you start applying this stuff to real-life scenarios you will notice how it works like magic in a sort of scientific way but don't have high expectations. PUA techniques like everything else in life are not prefect and some will not work on everyone; simply what works on 20 girls might on a few so don't get frustrated and keep playing the game and receiving rewards. You should be able to strike up a conversation with nearly anyone in a social gathering to some degree. After "field testing" take your results and decide what went well and what went wrong and pick-it up and improve your game the next time you go out.
4th: Everyone has a preference and suffers rejection. You like Asian girls. But from what I read it appears that you like Shy-Girls. You believe that you can only get the "Mail-Ordered" bride type and even with those it just doens't work out in most cases. What is happening is you are matching your social skills with a similar social skill type: a quiet Asian woman. Once you open up and develop your social skills more a lot more opportunities and different types of women will become available in your life. People often match themselves with other stereotypes e.g. an anti-social rock-star with a quiet goth-chick however this is not always the case. What you must understand is that there are a lot of available women out there and you have to get over being rejected. Once you can over-come rejection and accept that some women will reject, some will be social with you, some will take keen interest and some will flat-out be adored by you then you can approach the field with a different perspective. You are bound to get rejected sometimes and even the best Pick-Up-Artists in the world get rejected sometimes. The best fighters in the world have lost a fight or two. You know what made Bruce Lee such a great martial artist? It was that he lost a few fights. One of the greatest martial artists of all time was a man named Pai Mei whom is believed to have been a fictional character. However, he had a student named Ng Mui (a woman) who is portrayed by Uma Thurman in "Kill Bill" part II. The story is legend but is believed to be true according to several martial arts references. Ng Mui lost fights daily to Pai Mei (White-Eyebrow) and eventually earned several ranks within the system before having to escape death during the burning of the Shaolin Temple in the 1600s. Some stories suggest she fled by boat but other references say otherwise. What is certain is that she created the Style called Wing-Chun Kung Fu which was later passed down to Yip-Man whom instructed it to Bruce Lee. The moral of the story is that you will lose many battles in the field as a PUA but will continue to improve until you start winning some victories.
Finally: Looking like John Mayor can work to your advantage after all he is the man that dated Katy Perry right? So what your saying is that you sort of are the Orlando Bloom looking type. Mystery one of the greatest PUAs in the world probably has similar features. Use your looks to your advantage but remember that looks aren't everything and are only one part of the package. If there is anything that you can do to improve your look or style or body language then implement that into your game. Just go out there and be a fun and comfortable guy to be around.
CHAT