I always have a hard time getting to sleep, and I am usually awake till 2 am or later. How can I sleep more easily?

Sleep timing. If you go to bed late but can then sleep well for 8 hours it is a sleep timing problem. If you are wide awake at midnight but life's schedule forces you awake in the morning that is the problem. Youth tend to have this problem. Keep light including tv and computer at a minimum after 9 pm. Use bright light in the morning. Low dose melatonin at night can shift your natural bedtime a little also.
See your doctor. . This could be the result of poor sleep habits, medications, caffeine or other stimulant intake. Your doctor will take a thorough history and make specific recommendations.