Juggling Life With A Teenaged Daughter

I cannot describe what it like to raise a daughter. Well, that's not "entirely" true. Being pregnant with her, was the funnest & often not so fun. Having a lil human being growing inside me. At first, it was scary. Not knowing if I do the pregnancy right or not. What would happen to her? Skip forward to February 16, 2003...it was the greatest day EVER! I'd get to meet my lil girl. Some complications later, and lil Hailie Aleiha-Rae was born. Skip forward to Today...and I feel like I've done something wrong to her, by her or even screwed up somewhere in raising her. Now that she's nearly 18, I feel like I have "def" screwed up somewhere. She met a boy {well he's 19-not much of a boy}, fell in love & is thinking & talking about starting a family at SEVENTEEN!! When I was 17, I NEVER thought of things like that. I was on the Dance Team, had a part-time job, went to school full-time & even saw the inside of my HS on a SATURDAY for Saturday School. Had my DL {she does not}, my own vehicle. Friends that would want me to take em here or there. Went to clubs....I enjoyed my teenaged years. I fear that she's choosing the wrong path. Do I let her choose this path? Or stand my ground? She missed my 40th birthday. Broke my heart. But she could care less. If she did care, she would've made sure that she was where she was SUPPOSED to be! Idk what to do or say at this point. I get told to let her make this choice. Leave home at 17 & have the life that she wants. Even if I'm not included. At least til she needs me for something. Or to surprise me with news of her being pregnant. I don't want to be called Grandma. I was thinking Mimi or something catchy. -And then I'd be watching a baby. My fiance thinks that I'll be helping her raise this baby or babies {she drops more than 1 egg at a time}. This has thrown me for a loop & into depression. I just want my lil girl back. If anyone is reading this, how did you cope? Have you ever gone thru something like this before? What did you do? How did you handle the situation?