B.L.E.A.C.H

it all started when she got this 4 new friend, we began to drift away from another[can't be seen but we rarely talk much]. i don't feel comfortable talking with her anymore. then she, me and this 4 new friend started hanging out. even if i call it hanging out, i don't really get into the circle.
it is not my nature to talk about my feeling to others. so it is kinda hard for me to express what i want. is she bored with me or what? i get pretty awkward when it comes to this kinda things. she knows i'm not the type of a caring person. but i always ask when she looks in trouble. i never phoned any of my friend if it's not important because i'm afraid to trouble them. she also the kinda person that rarely ask for help. she never really there when i need her. i don't know whether i really there when she needs me or not.
she haven't contacted me in a month. it is still school holiday. she never told me whether she is going on a holiday or not. i'm not really angry with her because i kinda think i was wrong too   but i don't know what made her angry towards me if she is angry.
i can't imagine what i'll do when schools starts. i don't even know how will i react when we meet later on.
i felt like being a soda can where people can use and throw me away whether they want to. i still wanna be friend with her. i don't know bout her though. i'm confuse and don't know what to do.
should i still call her 'my friend'? is she starting to distance herself from me? should i stop hanging out in that circle? should i just make myself invisible?
i know its childish and it's ok if u think like that but this what's currently bugging my mind. i am still 15 years old. our school don't have any school counselor so i'll just share it with u guys.