Yes it is quite hissy. I've been there, battling with trying to mic up acoustic guitars and record vocals with a noisy PC. You could try some noise reduction software but it may not be possible.
Another route might be to add some percussion to mask the hiss, tambourine or shaker. The song seems to need something in that direction anyway, maybe from verse 2 onwards to add interest. Even a swirling synth pad in the same frequency range, that might work on the intro/verse 1.
Good song, I like your fragile vocal delivery, works well.