Usually you don't get a say, because being 16 , it is hard to find a family who wants to deal with a teenager. It is not the end of the world, pray for a nice family, and who knows maybe you will have a wonderful family who will feed you, love you, take you places. If you tell them you have special friends, I am sure they will allow you to have them over, or you can visit with them,so long as distance isn't a problem. Treat them nice, and they will do the same. Earn their respect, and you will reap the benefits. Good luck, hang in there, you will be fine!!
I'm sure you will have some say, and when your talking to possible parents that you don't like, if they're somewhat decent, they'll understand if you tell them you don't think it's going to work out. And, the friend thing I'm sure will be okay. Especially if you have a phone. You can call or text them, and, depending on where you move, you might even live close enough to still mmeet up with them somewhere. Although, honestly, almost every apdoptive parent wants a baby, so your chances of getting adopted aren't to great, but there's tons of awesome people out there, and if you make them feel bad enough, and make sure they know that you weren't messed up in the system, you could get parents easily. Either way, I sincerely hope everything works your way. Best of luck to you.