tell someone how i really feel about them

I want to tell my sister what’s on my mind.I’ve always been able to tell her what’s on my mind whether it’s good or bad to her face,but this time i don’t want it to feel like i’m betraying her.She might feel in her head,”You’re suppose to be my sister!” But i just want to tell her the truth.
She is not the same person and it all has to do with her new friends and how others influence her actions instead of her thinking for herself.She does and listens to whatever people tell her like she doesn’t have a mind of her own.All because of what she wants others to see her as and to fit in.Now she’s stealing,talking back to mom,being with boys,getting in fights(well that would’ve happened eventually with that mouth she has).I can’t even joke with her anymore without her getting mad.But we haven’t been cool for a while now.
The other night she talkin to her friends boys at that saying she already had a dick in her and it was big.And i’m in the next room like OMG!! what is she doing speaking in that foul language she don’t think i can hear her then run back and tell mom?
See that’s why people call her a whore and i want to tell her i heard everything she said on the phone.Tell her that’s how yor reputation get ruined and rumors get started.
One reason i don’t want to tell her is because she’ll be angry for a minute then she don’t care and forget all about what i said.In some ways she like mom,hard headed and don’t listen to a word i say.
Should i tell her she’s turning into a disrespectful,brat?She’s a bitch and turning into a whore and one day she’s going to end up where she doesn’t want to be?

oh my days, its such a mess first time i’ve talked about this, right here goes, 7 months ago my mate tried settin me up with this guy, anyways she married but says she loves him n he loves her, they been on n off n she been going from one to another, and so her husband dint get suspicious we had to pretend we was together when he was about, n thats whn i realised how i felt well recently i have fallen for him he so sweet n lovley i can tell him anything and him me, my mate split with her husband n told my mate it was over between them, now she back with husband but keeps sayin she regrets it, problem is i am feeling so strong about him n i know where his heart is n i dnt want to ruin our friendship, i just so scared n torn help cant talk to anyone

I’m gonna pour my heart out to someone and say how I really feel.

I’m actually excited to see what they say.

well you see.
boys are stupid.
i finally told john how i felt.
i went into this basically whole rant about him and lesley and me and him.
urgh!
well it left me more confused because hes all like yeah i like you. and stuff. but its not the time or the place and stuff.
i say keep it bottled up in side.