I need help!!!!!

Ok here is my problem.. I have this hair that is like the biggest pile of s--t it is always like frizzy and it seems to go in like 20 different directions at once.. It`s also pertty thin and whispy and is extremely hard to do anything with.. And if that isnt bad enough I have what I would call wavy hair not really curley I guess. Anywyas I was just wondering if there is anything I can do to make my hair not so thin and whispy and make it easier to work with.. I mean sometimes it looks good I think but not very often.. Anyways im a guy I have brown hair and it`s about 2 to 2 1/2 inches long. If anyone has any advice on how to make my hair straighter, smoother, and not so freakin thin and whispy I would love to hear it...