Big Sister

I did not start dating until I turned eighteen, a little later than most, I guess. I've only had one relationship which lasted for the better part of two years when you ad it up, and when it ended it tore me apart, I'm still not comfortable talking about it.
My little sister started dating a year or two ago, which is ok with me, but what worries me is how immature and insecure she is, and it sounds like her new boyfriend is moving a little too fast. I think she should make her own mistakes, but I feel if I don't voice my opinion she might end up getting hurt badly like I did. I don't want to be the one to talk to her about sex, but I would feel better if I at least knew what was going on. Trouble is, we aren't very close and never have been, we're strangers to one another. I don't want to get involved in her emo world, and she doesn't care about my life, which is how I like it. Having a serious talk might tear down some walls, walls I have spent a lot of time building up.