You matter, even you feel like this keep that in mind. We can't please everybody everytime. Indeed there will be some point in life that even the ones that like us the most will be desapointed by ourselves.
I will not insult you, and even you feel like that I bet you rather want someone to praise you and say that you're important.
Not everyone is perfect, and sometimes the most selfish ones, are the ones most people recognize some value. Some people are just good to pretend they are what they aren't.
I do feel the same, because in my life, at college, there isn't a single person who cares about me, who likes me, who prefer to be with me than with somebody else.
It's inevitable for me to search the reasons that explain that. I have been called selfish a million times, specially by my family members. But maybe I'm not.
It's so hard to give an hand to someone when we are struggling. Maybe you do need to be more selfish than you are now, maybe you need to think more about who you are and what you want, than think how to be the perfect person able to please the others.