This is the right way to play the guitar. Its really short and simple.
[ Tab from: http://www.guitaretab.com/s/selena-gomez/282875.html ]
e|--4-4-4-4-4-2-2-2---4-4-4-4-4-5-5-5----------------------------------------|
B|--5-5-5-5-5-5-5-5---5-5-5-5-5-5-5-5----------------------------------------|
G|---------------------------------------------------------------------------|
D|---------------------------------------------------------------------------|
A|---------------------------------------------------------------------------|
E|---------------------------------------------------------------------------|