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It's true that you don't choose your birth parents. But that doesn't mean they'll love you. In fact, a lot of children who were initially wanted by their parents are also abused by them, even though they claim to "love" them. But that's not true. A real family is one that loves. You may be related by blood, but if you don't love each other, that's meaningless.
Everything God works out is meaningful and he works out everything.
My favorite verse is my favorite verse to remind me of that:
And we know that for those who love God all things work together for good, for those who are called according to his purpose. Rom. 8:28