How to cut ties with "friends"?

I am at an age where I really dont want/need many people in my life. I am much happier with few people, and quite tired of people who are bothered by one petty thing after another, as I am finding that it effects my overall well being. I tend to attract people who are always consumed by trivial drama, and use my energy to boost their spirit, while dragging mine down. Life is way to short to engage in these fruitless friendships, and I need to empower myself by taking back my life. Thanks