Confused about the illnes. Weaker.

Hello Sir/Madam, Since childhood I am suffering from this problem. I have a weird feeling always which does not allow me to live freely. I am little afraid of many things. For example - I am a student and I have two or more books of the same subject. So, after completing one book or if i dont read the book which i read daily and proceed to another, i will have a feeling like the older book can be angry with me as i am not reading that and i will forget everything as i have cheated that book by reading another book. And after that there is a humongous pressure on my brain and i start afraiding of all that. And all that ends in an anxeity and God knows how i get rid of that after few hours/days. This was an example only. There are so many things which i intract with in my daily life that create a fear which leads to anxiety and pressure on my mind and i carry it all the day which makes me unable to do so many things which are done by a normal guy of my age. I am being mentally weaker.