Shri.Easwar,
My knowledge of Biology is only limited to my +2 schooling.. But I have read quite a lot about it, when I came across the subject of 'surrogate motherhood'..
If you are really curious in keeping your blood lineage, then you may opt for a surrogate mother with unknown ovum(available in ovum banks) and ur sperm.. Anyways, my advice again is, still you have lot of time & hope..I may not be that much experienced in life, but then, my suggestion is based upon my readings. Yes, you still do have lot of time and nothing to be frantic about it..I mean it, when I say this.
16Yrs is not that long lost to worry about..., cos I know from my mom's dad, who had 2 children even after I was born. ie, I have 2 aunts younger than me. I think, that vetran must have achieved it in his age of 45. I personally know few couples getting children at the age of 50.
If you are in Madras, you may seek consultation from G.G hospital, the one run by movie star Gemini Ganesan's daughter.I was told that doc's hands are blessed. My own cousin form U.S has taken a year long holiday and taking treatment from there. But, Gujarath and Rajastan are the most popular places.. May be next time when I touch Ahmedabad airport, I will note down the contact info and post it here..
I think you will find more information about this in internet.
PS: If you are on adoption mode, pls dont confine yourself with a Brahmin girl.. Would appreciate if you could set an eg. to the community, by adopting a dalit girl.. Like how Angelina Jolie adopted black kids. You can be a role model..