Mixed feeling....

Having a mixed feeling now.... what sld i do? Maybe i sld juz ignore abt this feeling and continue wif my life. But its hard when u see ppl enjoying themself and they sort of dun care abt u and ur feeling.....THIS FEELING SUCKS!!!!!!!! There are times where i really feel like walking away but something is telling me not to. What will happen if i walk away? Will they thinks that i am petty? But staying there makes me feel alone and rejected. Even though i act like i dun bother abt it but deep inside of me i am thinking tat y and i being rejected? Maybe i am thinking too much but the way they act and treats me is different le. Sld i juz leave them or sld i juz stay and act as if i dun bother abt it? Can someone give me a answer?