"HOW" Do We Know ??

Whenever I sit with myself and think about the outside world, my mind is befuddled with unanswered questions of life!! I am lost into the continuity of the questions leading to nowhere and asking me again and again to solve them, asking me to answer them. I always think "How do we know what part of us is fake and what part is real!!" Sometimes when i don't like someone and my mind wants me to do something wrong to that person; but I don't do wrong and behave good to him/her . Does that mean I am being a diplomat or it means that i am controlling my mind to behave good (which is good)!! How do you know if you are being a diplomat or you are actually good to that person?? How will you rate me on this?? Good or bad?? Your friends will always say "Bitching is bad" but they will also say "You should speak out whatever you feel". So when I feel not so good about something/someone; and I try to share it; is it bitching or speaking out?? People often say that there exists a very thin line between friendship and love.. But how do you know where does that thin line exist?? Why do you always think its friendship and others think it as love?? How do you know if you are crossing that line or not?? There are different philosophies of life and different paths to live your life , but how do you know whats the ultimate aim for which you live it?? Is it you who decides what matters more for you or is it people who judges you on what you decide?? People find happiness in different things and some find it in the average life which they live . So is there anything wrong if I want to live average life ? If happiness is the ultimate goal of life and I find happiness now , why do people judge me and say "This is not what you are meant for". I know "Hard earned happiness lasts more and is more precious" but how do you know that the present happiness won't last more!! What if small things make me more happy than the success in life ; does it still matter to run for success?

My mind is stuck between fake & real, love & friendship, happiness & success!!