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Laurel is 100% right --- blood is very important, and nothing that anyone wishes about it can make that fact go away.
30 is too old to *start* trying to get pregnant. Fertility peaks in the late teens and begins to decline at age 27. If you have less than 100% normal fertility (and it's impossible to know for sure if you do) then it is a GAMBLE to start trying at 30!
The prudent age, if women were willing to grow up and realize the biological realities, would be between age 18 and age 27. Assuming that you want to at least finish college, we can say between 22 and 27 . . . that is a five year window! Maybe you'll be lucky and be fertile until you're 35 or older, but if you want to take that risk then you also run the risk of raising a child that isn't yours and never will be.
Adoption is noble, but it isn't the same as blood family. So your biological family sucks, and you love your adoptive family? Well, all that means is that your *real* family isn't too great, and these people who are babysitting you are realllllly nice.