God loves all people equally. God does not make mistakes, and you are certainly no mistake. There are no second-class citizens in the kingdom of God. As a gay Christian you already know that you did not choose to be gay. That is one of the hardest things we must deal with on an ongoing basis. Some straight Christians actually (and mistakenly) think that being gay is a choice. We must constantly, in love, remind them that being gay is just the way things are for some people. But as a gay person you know the reality of the situation. So even though some people do not understand that this is not a choice -- you must move on with you life.
Because it is not a choice, it cannot be "unchosen". If you are really gay that's OK. God knew exactly what He was doing when He created you. There is nothing to fix because you are not broken. You have a unique place in this world and that means that you will also have unique ministries and opportunities to serve God. Only you as a gay Christian can fulfill those ministries. If you don't do it, it won't get done.
Being gay is just the way things are for some people. People with blue eyes cannot choose to have brown eyes, and people with brown eyes cannot choose to have blue eyes. In the same way, straight people cannot choose to be gay, and gay people cannot choose to be straight. God is the creator and in reality there is nothing wrong with having blue eyes or brown eyes, or being gay or straight. But no matter what God has created us to be, we as Christians are responsible for living godly lives based upon the reality of who we are. So if you're gay -- great. Just like straight people you must find a way to live your life fully as a gay Christian and dedicate that to God.
Just remember how much God loves you and thank Him every day for making you exactly what you were intended to be. While other Christians may not understand you -- God does. So remember to live an authentic life and do not bear false witness to anyone, including yourself.