I've hypertension and i have proteinurea and i'm not diabetic, the presence of proteins in urine is it due to kidney disease or to hypertension itself?

Kidney disease: It is due to kidney disease which in turn may be caused by the hypertension. See a nephrologist.

Proteinuria: Long standing poorly controlled hypertension can cause mild proteinuria even with normal kidney function. But moderate to severe proteinuria due to hypertension is generally associated with abnormal kidney function. suggest you ask your doctor to measure the amount of proteinuria (called random urine protein to creatinine ratio) and refer you to a nephrologist with abnormal result!

HTN and proteinuria: Hypertension can indeed cause proteinuria, though typically this indicates uncontrolled hypertension. Polycystic kidney disease can cause proteinuria, and this indicates a worse form. Other kidney diseases do cause proteinuria and hypertension together.