The age old question: Can you go to Heaven if you commit suicide?
How will we know? It's not like we can pick up the phone and ask them. Although I cannot conceive that our merciful God will not have any circumstantial clause where we can be forgiven and still go to heaven, I understand that it is a great sin and one the Bible warns us against. I also know that a lot of people have been saved by the bell so to speak, like the murderer who hung on the cross next to Jesus. When he realised Jesus is innocents and took accountability for his own sins with true repentance, God told him that they will be together in paradise that same day.
Why would you want to take your life? It is so unnatural, that even people who commit premeditated suicide, almost always end up with scratch marks on their necks, hands, or car handles, as evidence that they wanted to quit at the last minute, but wasn't physically capable of doing so successfully.