I don't have a problem here; it is you that has a problem: you assert that suicide is a sin, yet except Jesus's intentionally taking his own life when the definition (which you have not rejected) is the intentional taking of one's own life
.
I have not made that assertion, nor the assertion that suicide is never a sin.
As an example, you are wrong if you try to claim eating is a sin, yet you would also be wrong to say that eating is never a sin [see gluttony].
There is also a categorical difference between what Jesus did and suicide. This is the basis for my disagreement with you.