Whyyy is all I want to know things are like they are?

I'm 14 and I am the youngest of 4. My mom was married to my sisters dad but he died. Then she met my dad 7years later. They were engaged then came ME. They broke up, my sisters got older and moved out now its just me and my mom. She works full time at the hospital. I see my dad sometimes but its not a close relationship and my sisters tell me I should at least try because dad is a big part of my life and I need him in it but I really dont care. I started to stay home by myself since I was 8. I dont recall my mom ever teaching me about sex and other stuff your mom suppose to talk to you about. I have always done homework and projects by myself. Dont get me wrong I have never failed or made below a B in my lifetime. I know not to have sex or smoke or drink or do crazy stuff. Not because somebody taught me about it,because I feel I had to found out for myself. I love the internet and for ANYTHING I need to go I always have my laptop waiting for me to research. My mom works all the time, I feel as if I could sneak out the house and she would never know. Im not crazy enough to do it. Sometimes I feel as if she doesn't care. Stuff about boys,sex,your period and all that I feel my mom should come and talk to me about it but she doesn't. I mean I have friends parents that are involved in there life, help them with homework and stuff,go out with them,support them in extracurricular activites but not me. My mom is always at work or sleep. I would love to do gymnastics,cheerleading,pageants but I wouldnt have support or a way to practices or whatever. I never do anything for spring break, summer break, or anything. For Christmas, i get what I want,my mom doesnt surprise me with little gifts like other parents do. She would even work on my birthday and Christmas, Do you think God blessed me to be so independent at a young age because he know my mom is tried and has to work all the time? I really hate my lifestyle. I been at home everyday this summer except Sunday and thats for church/