We tend to develop a different personality for people around us to hide the real us.
Everyone of us have gone through a time where we came to our actual senses and stopped showing our actual emotions. It's not your fault :) . It's not their fault either. We live in a society full of people thinking about themselves. They call for you when they need you. For people who tend to help others suffer a lot. But those sufferings are part of the training. If you are like that then you'll probably have a blank face while having conversations with people. Slowly and steadily the emotions will fade away. Then you can get along with people without giving a fuck. Because if you give too much of fuck to other people's shit, you won't have time to arrange your own.
People are only aware of their happiness. It's always about "me". Your heart will lead you to happiness but your mind will lead you to smartness.
Cutting it short, fake friends won't compromise for your happiness. If you wanna know if they are your real friends then test them out by putting them in actual situations. Let others fool you without them knowing that they are actually being the selfish ones. Because when you aren't there for them anymore, that's when they will realise what u were actually doing when u were with them. 😉