Help singing high notes?

I sing country music and a lot of my favorite songs have high notes in them so they are the only ones i can't sing! It would help if i could get some practice but I dont want anyone to hear me until I am ready to start a big career. I've recorded I would have gave up on this dream long ago but my gf keeps pushing me back to it cause shes a poet and the likes me to sing her poem. And when I do get better how can I find people to play in the band? please help