Facing emotional blackmail from parents

Your mother may threaten you with suicide and other close relatives may even warn you about honor killing, whereas it is your life hence you can take a considered decision  about this.

You are a matured person and having independent source of income to sustain your expenses and to live your own life without depending on others, hence you may better go ahead with your proposal to marry your boy friend and if necessary you may seek police protection if there persists any danger to your lives. 

Well since you are quite a major to decide your personal matters you have legal right to do so, however to have regards for parental desires is just social. religious and or  emotional. If you feel any threat of involvement at the emotional blackmail by your parents , simply drop a complaint to Police station disclaiming the responsibility and also informing them about your legal rights being infringed by your parents. That will help you out from any future consequences.