Oily skin is not a body defect and there is no need to worry about it. Teenagers are mostly affected by it due to hormonal increase. This can cause pimples and other skin related problems but it is just another phase in life. People with dry skin are prone to get acne as well.
There is no reason for you to worry since the oils secreted in the skin glands are for your good. It helps flush out the toxins and prevent your skin from aging.