Loneliness Support Group
Loneliness is an emotional state in which a person experiences a powerful feeling of emptiness and isolation. Loneliness is more than the feeling of wanting company or wanting to do something with another person. Loneliness is a feeling of being cut off, disconnected and alienated from other people. The lonely person may find it difficult or even impossible to have any...

Maybe you should try giving people a taste of their own medicine--it helped me!
I am here if you need to talk. You can message me
It hurts. You end up feeling used. You're already feeling this at 17. I would advise carry on being a good and thoughtful person BUT don't give too much of yourself. If someone proves worthy, then they get your special friendship and support. The rest, dont go too deep with them.
Someday, someone will value you for the good friend you are.