I did love a girl and it's been 7 years

I tried to convince my parents with all support from her end and me.. but at some point of time she is telling me to make it fast as her age is 30. She says to make this done in one mnth. I did try and my parents still not supporting. Later this got messed up and she started forcing me and started blackmailing me with things like photos and msgs. She also said if they dnt agree I will go legal and take u out from parents. Now I am really confused and I am in depression state my work is impacted and can't do anything. What to do. My dad had discussion with her but she is not involving her parents at all. So that, we acn sit and talk to make this mutual understand. She is saying my parents will not come until we talk about marriage. Now I feel scared of her and little tensed. The convincing started in a smooth way because of her age and force things went for a toss. I did wait for 7 yrs because of my reasons on my career. What can I do..