Can I get married to my fiancé who is a US citizen even if I am out of status but my visa years is still valid?

Generally, a foreign national who entered the U.S. lawfully and with inspection may become married to a U.S. Citizen and succeed in a marriage-based application for adjustment of status to become a Lawful Permanent Resident (to get a "Green Card"). This is true even if the foreign national has overstayed a visa and is out of status. Of course, there are many more details that address eligibility. It would be wise for you and your fiance to consult with an immigration attorney who, after learning all of the relevant information about you, your immigration history, etc., would be able to advise about immigration eligibilities, options and strategies, and could offer legal representation in the often quite complex application process.