I am 28 years old , when I was 21 felt in love with a girl and in turn the girl also started loving me, after a while we became closer knowing each other.. Everything went well until she started becoming possesive of me, I really felt suffocated with her behaviour and started to give excuses to get away from her before I've realised its time to breakup I've realised that she would do something crazy if I confessed her about this( with few of her crzy stunts)... however I've managed it until now trying to avoid her and stuff but now she calls me up and says her parents want to talk about the marriage with me. I really have no plans of marriage now (I was really a fool to drag it until here in a hope that she would change her behaviour and I will marry her she doubts on me for even a minute things I stopped socializing oz of her) I really don't don't have courage to talk about it to her parents and guilty that I dragged this for 7 years now.. please help me before my life becomes worse.:(

You're not going to want to hear this, but facing this all, is the only way to make it truly go away.
It's been sitting on your conscious hasn't it? For 7 years nonetheless. Go talk to her and go talk to her parents, tell them straight up...

This is how it is... and explain all that's on your chest, then if you leave there (alive) you can put this all behind you, and trust me, your life will start getting better. Crack open a beer and turn on some "That 70's Show." You'll be good.

I have a feeling you are not an American in the US, who has no strong religious background or customs.
It would help to know where you are and what type of background she is coming from.
In some countries, the man actually is expected to pay a large amount of money to the parents of the girl he makes promises of marriage to and then changes his mind.
Even in Europe and the early US this was true.
The sooner you face her parents, the sooner this will be over.

Joy, such good advice that I am giving you a "like" and applause.

Country is going to make the difference!

I think UhnonimuS's advice was even better! It'll be just fine, and indeed, how brilliant just finish it off with a beer and the "That's 70's show". Sounds cheesy perhaps, but there's some real truth in it. Don't let it drag on any further, confront the issue and tell everyone up straight what you feel, PARTICULARLY your girlfriend. Doesn't sound healthy hiding all this, wonder how you managed for 7 years anyway without some heavy fights and still going on.. ORRR you really do love her but just don't want to face it now cause with relationships and love comes marriage aka responsbilities. Perhaps put it in a different perspective? But to me I'd go with the first option; face her up front tell her you're not ready yet, you're suffocating me, etc. see what she does and find a solution! Now, don't let it drag on mate, that will get us nowhere in life...