My fear

what age are you?

Im nineteen..going to be twenty

You're already thinking about marriage? How about just live in the present and not worry away about the future. There is no definite way to find out if you will happily marry and stay with this guy. Only time will tell, so don't rush anything and enjoy the moment.
May I ask why your dad might object your relationship?

Why do you think that your dad will oppose your relationship? How long have you been dating? If you are serious about someone, I find it hard to believe that you have not introduced him to your family. I also find it weird that you feel that you cannot communicate these feelings with your special guy. If you feel so close to him, then you would be able to tell him anything. I think that what you may be experiencing is infatuation/lust and not true love. Being 19, you may think that you know what being in love is, but do you really?

No...its not like that.........my mother,my bro knows about him and know him very well...and they are supporting me...but I don't know how my dad going to react...when he comes to know about this?

There can be status issues for my dad...............that's my mother's opinion.....and I also think the same.....

It's common for dads to be wary of their daughters boyfriends. Its the protective side of them showing. You're his little girl. That said, all he may really want is for you to be respected and treated well by him or any other boy.

Also. I think it would be much better if you tell your father about him than letting him find out another way. He may be hurt and a little suspicious of you both. Feeling like you're sneaking around behind him. Talk with your boyfriend about being nervous for the two of them to meet. He may be just as nervous and wondering why he hasn't met him yet.

Sit down with dad and tell him about your boyfriend. That he hasn't met him yet because you were a little nervous about the meeting. He'll understand that because at one time or another he was a boyfriend too. Right mom?

As for a happy ending, take each day as it comes. You're both young and have a long future a head of you. You have college and a lot of maturing to do before you decide to marry if that's your intention or hope. Marrying at 19 isn't always a good idea. You're just out of the starting gate with your life and marrying too young can lead to a very unhappy ending. I've seen it within my own family.
Enjoy your time together without any pressures hanging over your head and worrying about what's to come next. If you're meant to be then it will happen.
Happy endings are in fairy tales and life today is no fairy tale. Life is what you make of it.

Thankx a lot.......I will try your advice but not this early..........1 or 2 years later

Why are you so scared of your dad? Apparently your parents are divorced, otherwise how can you keep this a secret from him but not your mom and brother. Yes, your parents gave you life and you need to respect them, but believe me, you can't let them dictate to you what you do for the rest of your life. This is codependent behavior and is very unhealthy. Codependency means that you are constantly looking to another person for approval/reassurance. Unless your boyfriend is abusing you, then you can't allow your family to dictate who you date. If you really care for this person, hold your head up high and be proud of him and your relationship. Don't be living in fear. Good luck