So i just heard my sister say she has had sex, she is only 14 years old, I confronted the situation and asked her if it was true, she said yes, I feel disturbed and very mad. I mean I can't believe how the young people are these days, not being in true love, and just having sex. Seems wrong to me, but would like to hear what everyone thinks, should I tell my parents about what I know?

IT'S WRONG.
THEY'RE NOT ADULTS AND THEY MAY NOT KNOW ABOUT HEALTHY SEXUALITY.
A HEALTHY SEXUAL MALE OR FEMALE HAS TO BE AT LEAST 18 YEARS OF AGE OR OLDER AND MUST HAVE A PARTNER THAT LOVES THEM.
PLEASE, IF ANYONE ON THIS SITE IS 14 YEARS OLD, DON'T DO ANYTHING STUPID.
Many stupid things are normal.
that said, it will depend on your local society...
Im surprised she could even have one at 11.
Show her how to please a man, how to deepthroat, and how to swallow. She won't have to learn from some jerk who doesn't care about her.
but anyway. i had sex at 14 and i have regretted it. i seem to not be able to find the right guy and i think that all guys just want sex. only some guys could i ever see more. i had scares all tho time and my number of partners is high. at least i think so.
i would tell her to not even think about doing it again or you will tell your parents. its what i would do. =)
Acceptable? Quite possibly not, at least to her family, etc.
Good for her? Depends entirely on the girl, but if she's reasonably mature and it's all consensual and safe, it's not that big a deal.