Holy Crap...my sister

So most of you probably don't know much about my childhood. Well, my dad cheated on my mom (which I didn't know until I was grown) and pretty much never paid much attention to us kids at all (me and two brothers). He would pick us up once a year for Christmas to buy us whatever we wanted, but never paid my mom child support after they divorced when I was 9. My brothers were a little closer and my oldest brother still sees him but I have not seen him or spoken to him since my brother's wedding in 1988. He said to me that day "maybe when I die, you'll come to my funeral"....wtf? I was a child. You never made an effort to see me but when I was an adult I was supposed to? My mom gave us a wonderful childhood even though we never had much money. Then she married a neighbor I had known my whole life and I had (still have) the most wonderful stepfather on the earth, along with 2 cool step brothers that I had grown up with. Anyway, my dad met this other woman and started living with her. She was pretty nice to us...I always liked her. She had a baby 20 years ago. I saw my sister a few times when she was a baby then I moved away to college and have not seen any of them since. My grandmother kept me up to date with her life a little bit and I would see pics of her in the paper or from my grandmother. So I was cruising the high school grads a while ago and who should I find but my sister! I just sent her a message. I had always planned on getting in touch with her when she left home. I can't believe it has finally happened. I'm pretty nervous but also very excited to see what kind of person she has become.