Crossing the Sea (Edit #1)

[CRNDLSM]

I've been staring at this poem for half an hour, I'm not sure I'm coming any closer

Your river is cold
and it slowly cuts the land;intriguing, you're familiar with seas, but the description is enticing like you want to cross something cold, challenging yourself
its currents meander like
a slithering cobra.

Your bridge is strong - I like thinking of this stanza as a bridge, you even switch from 'you' to 'i'
built to last -
I can't tear it down.

But I have crossed the deepest seas
and you have not.I like it, you don't need a bridge to cross the river cause you can cross even the deepest seas, but it's like you want to tear down the bridge, or have tried. As far as the last line goes, I can't figure out the you unless it's general.  I'm confusing myself

Your river is cold
and it slowly cuts the land;
its currents meander like
a writhing cobra.

Your bridge is strong -
built to last -
I can't tear it down.

But I have crossed the deepest seas,
not you.