Anyone ever had the feeling that they were overwhelmed by too much things and I wanted to know what I should do to stop that feeling?
Most of my life.
Do you obsess about the things overwhleming you? Think about them to the point that your mind starts racing and you wish your thoughts would just shut up and give you a break? Do you have physical reactions to them when you think about them alone? (could be as subtle as cringing, clenching your jaw or your fists, digging your finger nails into your arm; more extreme would be things like "cutting," banging your head or fists on the wall to release some of the internal turmoil).
This is what I went through in high school, college, and beyond. What finally helped me was medication (for treatment of OCD, PTSD, and depression) and some therapy. What the medication did was dampen the "static" in my head, the incessant chatter and images so I could have a break from them). The therapy helped me identify past experiences I needed to "grieve" over and then move on from.
The medication and therapy helped motivate me to change the things I could change (hang on until I could change them) and accept the things I could not change.
Some people have an aversion to medication and therapy. For those folks I'd recommend, "The Feeling Good Handbook," by David B. Burns, M.D. There are sections on understanding your moods, how to "untwist" your thinking, etc.
Hope that helps.