>>1 what you need to do is live. Do things, try new things, learn new things. Doing that will give you material that you can communicate with. Now most 17 year olds living average lives aren't that interesting, myself included. But good communication skills come from being able to communicate with little material easily. Like all skills, communicative skills require a lot of practice therefore you shouldn't get so discouraged.
Focus on finding things that you love to do, finding those things maybe be hard at times, but just remember never give up on finding happiness ^^ I hope that helps.