My Note

[Todd]

Okay, suicide note. This has some good potential.

I'd be tempted to rename the poem to something more evocative. Maybe modify a line of yours that I like:

Exits Through My Fingertips

Then you could start with:

into the pen

Some more comments below:

I write
the only thing I can think of.

My thoughts hidden inside my head,
unable to make their way
onto the paper
that loved ones will read.--I'd like less step by step and more halting delivery. For illustration only this could be: These thoughts loved ones will read. The opening you currently have could be compressed to something like this. There's a little too much filler/redundancy at the moment in my opinion. The poem could be tightened for better effect.

As I write,
I feel all my pain--Rather than generic pain go for something more specific
exit through my fingertips--I like this image
and into the pen.

My words
dripping, in the form of ink,--I don't think you need to add the "in the form of ink" I think dripping implies blood and that should be enough here. The rest of this works for me.
onto the paper,
staining it black.

I write,
"Goodbye."--nice ending

Just some thoughts to consider.

Best,

Todd