It is not by any means clear that she intentionally drowned herself. Gertrude's account of her death suggests that she may have been unaware of her danger. If it wasn't an accident, it seems from the mad scenes that she was disturbed by her father's death "I cannot choose but weep to think they would lay him i' th' cold ground." However, drowning oneself was a traditional mode of suicide for young women with unwanted pregnancies, and this might also be Ophelia's problem, as her mad scenes also show: "Quoth she 'Before you tumbled me, you promised me to wed.' He answers, 'So wold I ha' done, by yonder sun, if thou hadst not come to my bed.'"
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She didn't want to live in the dark anymore about Brutus' secret life and was miserable.
She thought they would come after her in search of revenge for her husband; she decided to kill herself before someone else did
She kills herself because she finds out that Brutus had something to do with Caesars murder.
All of the consequences of Brutus's part in the conspiracy were also felt by Portia. She could no longer live with honour in Rome.
Because Ophelia was thought to have committed suicide and suicides were not entitled to Christian burial. This is a little unfair on Ophelia since, from Gertrude's account of her death, she had no intention of drowning herself and died by accident.
There is no reason for supposing that Ophelia is pregnant by Hamlet - and if she were it seems unlikely Hamlet would ignore the fact. Of course, there is no reason for believing in the Easter Bunny - but some people do.
kill herself
In Act IV, scene I of Romeo and Juliet, Juliet threatens to stab herself if Friar Lawrence does not help her.
Ophelia belongs to many people. Ophelia is when a person can not think independently.