Call 0800 1111 for childline if you need them, they're much more equipped to help you than TSR is, and its their job to help you so you won't be wasting their time. The majority of their employees have been in your position, so they'll understand. If talking on the phone isn't your thing, they also have an online service where you can 'email' them within the site.
For the last three years I've struggled with mental health problems, so I understand what it's like to feel like you're unable to connect with people, or like you don't matter. I'm coming out the other side of it though, I'm recovering. Trust me when I say it gets better. The world is a beautiful, crazy old place, and the chances that you are alive to see it are next to nothing. You have to grab life and cling on with everything you've got, even through the hard times, even through the absolute worst moments, because it is so ****ing worth it.
If you want to talk, or if you just need a friend, then PM me. You won't be wasting my time. I think that helping others is the best way a person can spend their time, and its rewarding to see others find their way out of places I used to be in. If anything, just keep speaking out about how you feel.