Because ya got married at 17 when ya knew every thing... Choose to honor the vow ya took before God
and because the Word says this
1Co 7:10 And unto the married I command, yet not I, but the Lord, Let not the wife depart from her husband:
1Co 7:11 But and if she depart, let her remain unmarried, or be reconciled to her husband: and let not the husband put away his wife.
1Co 7:12 But to the rest speak I, not the Lord: If any brother hath a wife that believeth not, and she be pleased to dwell with him, let him not put her away.
1Co 7:13 And the woman which hath an husband that believeth not, and if he be pleased to dwell with her, let her not leave him.
1Co 7:14 For the unbelieving husband is sanctified by the wife, and the unbelieving wife is sanctified by the husband: else were your children unclean; but now are they holy.
1Co 7:15 But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God hath called us to peace.