All perfect praise be to Allah, The Lord of the Worlds. I testify that none is worthy of worship except Allah and that Muhammad is His slave and messenger.
First of all, know that the door of Allah is always open and does not close in the face of anyone, and that Allah is Most Merciful and Most Generous and He forgives all sins no matter how great they are.
Therefore, no matter how great your sins are, return to Allah and ask Him for forgiveness and have trust in His Generosity and think good of Him.
Hence, you have to repent to Allah quickly and become upright on His obedience.
As for your thoughts and whispers, then you have to strive against them and seek to get rid of them. You should know that they will not harm you as long as you hate them and repel them.
As for shouldering responsibility, then having trust in Allah and believing in Him will help you in this, as well as your knowledge that it is Him Alone Who facilitates every difficulty.
We advise you to consult a trustworthy psychiatrist.
We ask Allah to protect you and keep you safe from every misfortune and temptation.
For more benefit on suicide, please refer to Fataawa 8676, 22853, 377509, 305578 and 34194.
Allah Knows best.