oh, but it's all so worth it

I think I have a rash or something. I'm not entirely sure, as I've never had a rash before.

If I touch a burning candle, I can feel the pain;
If you cut me with a knife, it's still the same.
And I know her heart is beating,
and I know that I am dead.
Yet the pain here that I feel,
try and tell me it's not real,
and it seems that I still have a tear to shed.