please please help me

ok so my sister has come after being gone because shes in the army and i really wanted to spend time with her but i feel left out she's been here but everyday even with others i feel left out they always focus on my twin and ever since kindergarden i've never been myself because i wanted them to like me but its still the same even my best friend chooses my twin =( i really like my twin but i feel left out everywhere i am and if i tell my family they will think that i'm overreacting please help i don't know what to do i feel i can't tell anyone even my 프렌즈 =(