What does it mean if you are always worried ?

i am in my mid 20's and i always seem to be worried about something and when im threw worrying about one thing i come up or think about asomething else uaslly about familly or finance's or if everything is going good i will worry about someone breaking in the house or if i leave the house did i put my cig out it just goes on and on i cant seem to just go one day without this constant worry so my ? is . is this normal or is this way over board and maybe well what should i do im tired of always being worried