Hey hey! Alrighty dude, I'm just going to go off of what Tommy said.
What is your voice type?
This song definitely out of your wheel house at the moment. Try out some softer, lower, ballads. When first starting to sing do NOT strain your voice for higher notes. This causes poor and unhealthy vocal habits and could actually lead to vocal DAMAGE, so be careful! =]
If you want to continue singing this song for the time being go into falsesetto in the higher notes.
We all hate practice when we think of it AS practice, but I would recommend vocal excersizes. 15-30 mins everyday.
Some basic Warm-ups:
Sing a 5 note scale on the vowel sounds (Ey, EE, AW, O, Oo) Ascending, then descending. Then move up half a step and repeat.
Falsetto: Start where your voice breaks. Sing an ascending 5 note scale strictly on Oo. Keep moving up by half steps until you notice tension in your throat, then descend. Repeat same scales more than once for maximum effect.
Sing as loosely as possible. Too much tension= BAD
Drink lots of water!