Will we change our tastes in movies or completely be a different person? I mean, will everything completely change? It scares me to become a totally different person.
I have same-sex attraction. Will I end up being attracted to women if I am truly born again? Will I not struggle with same-sex attraction?
Why would it scare you to become the person God made you to be? He created you to know, love and glorify Him, which you can only properly do from a born-again condition. Would you rather be cut off from your Maker, destined to an eternity apart from Him, alone in the dark torment of hell forever? It seems to me this prospect is far scarier than living according to God's design for you.
Same-sex attraction, like all sin, is symptomatic of a life not under God's control. Being converted, saved, born-again will not in an instant eradicate all the sin from your life. But it will put you in a place where you can finally live in freedom from Self and the sin it produces. As you walk with God, coming to know Him better and better, deepening progressively in your love for Him, and submitting yourself more and more to Him, sin in all its forms - including the sin of homosexuality - will fall away from your life.
When a person is saved, a host of spiritual things become true of that person immediately. They are placed in Christ, clothed in his perfect righteousness, justified, sanctified, redeemed, (
1 Corinthians 1:30) adopted (
Romans 8:15), made a co-heir with Jesus (
Romans 8:17), seated with him in heaven (
Ephesians 2:6), freed from the power of the "old man" - old, fleshly, rebellious, shortsighted Self - and made a bondslave of God (
Romans 6:6; Romans 6:22). It takes a lifetime to reflect all of these things in one's life, however. But, by the work of the Spirit within, one may be transformed becoming a holy, peaceful, loving, stable ambassador for Christ, living according to the truth of one's identity in the Savior rather than according to the impulses of the flesh.
Anyway, Paul the apostle answered your question in his letter to the Corinthians:
1 Corinthians 6:9-11 (NASB)
9 Or do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals,
10 nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, will inherit the kingdom of God.
11 Such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God.
1 Corinthians 6:19-20 (NASB)
19 Or do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God, and that you are not your own?
20 For you have been bought with a price: therefore glorify God in your body.