Parents only want the best and care deeply for you. They will worry, get angry and push you...but that is because they love, care, and want the best for you. Remember, there is no instruction book when it comes to being a parent. Keep an open relationship with them because it really adds trust to the mix.
Your sisters are and will always be your best friends. Yes, many will move away, and you will be brokenhearted...but nothing can break sisters apart...even distance! Oh...and a little thing like Face book helps tons!
And finally, younger self...don't be scared....because I know you will be..as I am now.