Committing suicide is forbidden in Islam for several reasons:
It is a violation of the sanctity of human life: In Islam, human life is considered sacred and taking one's own life is seen as a grave sin.
It is considered a rejection of God's will: In Islam, believers are taught to trust in God and submit to His will. Committing suicide is seen as a rejection of God's plan and an act of rebellion against His will.
It is a betrayal of the blessings and opportunities that God has given to the individual: Suicide is seen as a betrayal of the blessings and opportunities that God has given to the individual. It is believed that every person has a purpose and a role to play in this world.
It is an act of cowardice: Suicide is viewed as an act of cowardice, as it is an attempt to escape from problems and difficulties rather than facing them and seeking help.
There are other alternatives: Islam teaches that individuals have a duty to care for their own well-being, but also that they have a duty to seek help and support from others, particularly in times of crisis and distress.
It is a permanent solution for a temporary problem: Suicide is not a solution for any problem as it is a permanent solution for a temporary problem. Most of the problems that lead people to suicide have solutions and it's important to seek help and support.
In summary, committing suicide is considered haram (forbidden) in Islam as it is seen as a violation of the sanctity of human life, rejection of God's will, betrayal of blessings, act of cowardice and there are other alternatives to seek help and support.