How can I make my voice go higher when I sing?

I like to think myself as an average guitar/singer...Although I don't sing stuff that girls will like, like Bruno mars or NeverShoutNever there's not enough emotion put into it. Anyways I sing stuff like Frank Sinatra or Anything Rock. Right now I am 14 so I am going through puberty so my voice cracks but I can't get it to go high when I do it doesn't sound good I have my breathing exercises under control so any other tips?