Notes on Hamlet

At the start of the play I didn't have much background information on Hamlet but I thought he would come out successful. I thought he would avenge his fathers death. But he seems to be losing composure. He's just really unpredictable and as a reader it makes me unsure of what to think of him. I've noticed that with all the characters there is a central theme of lack of trust going on which will eventually just lead to more and more conflict. As of right now I can;t tell whether Ophelia is interested in him or what her purpose is so far.