What is becoming clear on all threads you are posting to is your faith is not real and that God's revealed truth has nothing to do with how you live your life. Your personal theology is based on moral relativism not God's absolute sovereignty.
Is being gay a sin? Not any more than being straight is a sin, what is sinful is how one with either orientation lives their lives. God will judge all mankind based on His definition of sin and God has labeled same gender sexual relationships sin and worthy of judgement. Also appealing to what straight's do is nothing more than an attempt to justify your own sin by appealing to how others sin.
What does it mean to love God with all your heart, soul, and mind? We can discern the answer from what Jesus said:
John 14:15
15 "If you love Me, you will keep My commandments. NAS
John 15:10
10 "If you keep My commandments, you will abide in My love; just as I have kept My Father's commandments, and abide in His love. NAS
John has something to say about those who practice sin:
1 John 3:4-12
4 Everyone who practices sin also practices lawlessness; and sin is lawlessness. 5 And you know that He appeared in order to take away sins; and in Him there is no sin. 6 No one who abides in Him sins; no one who sins has seen Him or knows Him. 7 Little children, let no one deceive you; the one who practices righteousness is righteous, just as He is righteous; 8 the one who practices sin is of the devil; for the devil has sinned from the beginning. The Son of God appeared for this purpose, that He might destroy the works of the devil. 9 No one who is born of God practices sin, because His seed abides in him; and he cannot sin, because he is born of God. 10 By this the children of God and the children of the devil are obvious: anyone who does not practice righteousness is not of God, nor the one who does not love his brother. 11 For this is the message which you have heard from the beginning, that we should love one another; 12 not as Cain, who was of the evil one, and slew his brother. And for what reason did he slay him? Because his deeds were evil, and his brother's were righteous. NAS