my existence is an affront to God.
No it is not.
^
God does not put any sin above any other sin. It is we who do that. There is nothing whatsoever that we ourselves, of our own doing, can do to be worthy in God’s sight. “For all have sinned and fall short of God’s glorious standard.” Your sin, suspiciouscoffee, is an affront to God, but so is your parents’. So is ender’s and Warbler’s. So is mine. That is why Christ gave himself as an eternal sacrifice for us, to cover our sin so that God might see us as worthy.
It doesn’t matter if you are who you are, or whether you can help it, or whether people think it’s wrong. It matters that you pursue a relationship with Him. No, you are not worthy of it but neither is anyone else. Your parents are not worthy of it. If they don’t accept you for your sin, they are hypocrites because God forgave them just as He forgives you. People who judge those who sin forget themselves and the truth of what God had to forgive of them.
“If God is for us, who can be against us? He who did not spare his own Son, but gave him up for us all—how will he not also, along with him, graciously give us all things? Who will bring any charge against those whom God has chosen? It is God who justifies. Who then is the one who condemns? No one. Christ Jesus who died—more than that, who was raised to life—is at the right hand of God and is also interceding for us. Who shall separate us from the love of Christ? Shall trouble or hardship or persecution or famine or nakedness or danger or sword? […] No, in all these things we are more than conquerors through him who loved us. For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.”
You are His child. Don’t forget that. He will not rebuke you for who you are.