I grew up an introvert, but mostly for the point of relationships, I was motivated to try to learn to always be aware of my exterior personality and appearance.
If you want a true relationship, and you become lovers before you become friends, you will end up one of those couples that argue about every little thing that doesnt matter to either of you and break up in no time. On the other hand, when I meet someone I dont think of relationships. Whether she is looking for something serious or just to date, if you try to push a relationship right off you will scare her away because she will think you are just desperate or lying like the other guys. Men and women are definitely different creatures. Plus you might not want her around you alot after you get to know her. You never want to push a relationship in the beginning. But you never want to be just friends either. Going on one day dates will friend zone you fast and theres no coming back from that. This is why dating is the perfect balance. Only romance or only a friendship is a fail. Try to keep it balanced in both.
As far as being aggressive or subtle when meeting them, thats a loaded question. Women wanting dates like aggressiveness so they know you are not wanting a relationship, but they dont like it being every other desperate skeezer does the same thing and seems so desperate. So if its aggressive it has to outdo the rest if she wants to date, and be aggressive with romance if she wants a relationship. Women wanting a relationship like a subtle approach but being too subtle too long, which isnt very long, is a major turn off. Aggressiveness altogether seems to work better for me than anything, but if im not aggressive enough it does the opposite. But sometimes being a little aggressive is what works and not too aggressive. Then playing hard to get works for a little while then it does the opposite, or does it? Being nice or being a jerk can work or be the opposite or can work sometimes and be the opposite sometimes, guess the mood. You dont know because every woman is different, and she doesnt know because shes a woman.
All in all, I just find its easiest to be myself and let the ones that like my style come to me. Every woman likes so many things that are the same, and are always the right answer for your own life too, so just focus on those things. Plus you can be yourself all the time and not have to worry about her complexities. The more you try to impress people, the less impressed they will be with you no matter what. In an age where romance is dead, thats pretty much all thats left. And when you really figure out how to do that, it wont matter if you are friendly or romantic, aggressive or subtle.