Our Watchtower repeatedly reminds us of Paul’s counsel to avoid becoming ‘unevenly yoked’. For example Watchtower 15th March 1982 page 31 says
” Do not marry someone who is not serving the Lord. The inspired counsel was not, ‘If you find a clean, decent person, it is permissible to court and marry that individual with the hope that he or she may eventually become a Christian [Jehovah’s Witness].’ Rather, God’s Word clearly says: “Do not become unevenly yoked with unbelievers.” (2 Corinthians 6:14) To marry someone who is not already a baptized Christian [a Jehovah’s Witness] would be to disregard that serious counsel.
But what if a Witness planned to disregard God’s advice and to marry someone who was not a baptized Witness? Unless there was some exceptional reason, brothers in the congregation would not want to solemnize such an unequal yoking. Nor would the Kingdom Hall be available for the wedding. It is available for marriages of two baptized Christians who are marrying “only in the Lord.” Or it might sometimes be used by two persons who are regularly serving God as part of the congregation and who will soon be baptized. By not allowing the Kingdom Hall to be used by a Witness who plans to ‘become unevenly yoked with an unbeliever,’ the congregation elders can underscore the seriousness of God’s counsel to marry “only in the Lord.”
At the end of the day whether you have a successful marriage is up to you two. However,please bear in mind our Watchtower 1st Sept 1989 page 19, states that ”Only Jehovah’s Witnesses, have any Scriptural hope of surviving the impending end of this doomed system .”