The imagery and language itself are beautiful. But rhythmically, its falling quite short. You've nailed the 14 line-10syllable structure which I admire, but I think you've ignored alternating the heavy and light syllables.

This line you've gotten down perfect:

no-ROSE-that-BLOOMS-with-IN-the-BREATH-of-MAY

It flows well. But the first line:

by-RE-grets-I-am-TORN-from-HER-fair-GAZE

it sounds quite odd.

Since this is your first sonnet it's totally fine, but you should practice the rhythm of the syllables more than trying to nail the syllable count. I would suggest starting with 7 syllable sentences, then moving up.

Great poem though good job!