JangoFett101
Think of it this way. Everything you've ever heard about ghosts spells out that they are dead people. Maybe they are tortured or lost or angry but they're still just people. You deal with angry lost and tortured people every day in your life and nothing bad happens and ghosts are much less capable than the living of affecting you. If you believe strongly in ghosts, believe in them for what they are, just like you and barely able to affect you. Its really not so frightenning if you realize not every ghost is a dead serial killer or lunatic. Just about all of them would be postmen or doctors or schoolgirls, just people.
As for UFO's there have been dozens of accounts of Alien abduction in the past 50 years (None of them proven) and there have been Hundreds of thousands of people sufferring from very normal sleep paralisys. Just statistically, if you wake and your body won't move for a bit it's much more likely you're having a neurological reaction to fear than being abducted by aliens.
Being young is terrifying but fear is a choice. You can absolutely rise above it if you think rationally and skeptically about the things that trouble you. It is how we all overcome the fears we face every day in life.