Focus on yourself. Don't let your world revolve around someone else, because people are temporary. Do your own thing. have your own likes. Don't do things for them. Do things for you. Don't stick around waiting for them. Don't give up your all for them because I guarantee you they will leave. Please. Live for yourself"
This goes for friendship as well. Finding a friend who cares enough to listen to you ramble about everything and anything (and are comfortable enough around you to open up as well) is one of the hardest, yet most beautiful things you can find. Don't stop looking for that person.