I have some good news for you. With some guidance, you can deal with this mentally. Depression will go away if you focus on something else for a long enough period of time.
I have bad news for you. Your sexuality is eating away at your ability to stay positive. Depression can come from the knowledge that something is wrong, and the harming yourself is often a sign of it. Consequentially, not being straight is a sin and a consequence of a sin. Romans 1:18-27, " For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness; (19) Because that which may be known of God is manifest in them; for God hath shewed it unto them. (20) For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: (21) Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened. (22) Professing themselves to be wise, they became fools, (23) And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things. (24) Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves: (25) Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen. (26) For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature: (27) And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet."
What is your end if you keep this up? Proverbs 5:3-4 " For the lips of a strange woman drop as an honeycomb, and her mouth is smoother than oil: (4) But her end is bitter as wormwood, sharp as a twoedged sword."
And unless you are saved, you have more than just the consequences for this sin coming as well.
Revelations 21:8, "But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death. "
Romans 3:23, "For all have sinned, and come short of the glory of God."
There is a way to escape. Romans 6:23, "For the wages of sin is death, but the gift of God is eternal life through Jesus Christ our Lord." Ephesians 2:8-9, "For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: (9) Not of works, lest any man should boast."
John 14:6, "Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. " John 10:30, "I and my Father are one." Luke 13:3, " I tell you, Nay: but, except ye repent, ye shall all likewise perish." Repent means to think differently of. Romans10:9-11, "That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. (10) For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. (11) For the scripture saith, Whosoever believeth on him shall not be ashamed."
Note: Mary is not God. Look at what Rebekah said. Luke 1:43, "And whence is this to me, that the mother of my Lord should come to me?" And what Gabriel told Mary in Luke 1. Luke 1:26-35 "And in the sixth month the angel Gabriel was sent from God unto a city of Galilee, named Nazareth, (27) To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin's name was Mary. (28) And the angel came in unto her, and said, Hail, thou that art highly favoured, the Lord is with thee: blessed art thou among women. (29) And when she saw him, she was troubled at his saying, and cast in her mind what manner of salutation this should be. (30) And the angel said unto her, Fear not, Mary: for thou hast found favour with God. (31) And, behold, thou shalt conceive..., and bring forth a son, and shalt call his name JESUS. (32) He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: (33) And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end. (34) Then said Mary unto the angel, How shall this be, seeing I know not a man? (35) And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God." If you put them together, she was a virgin that Jesus came to be born of with her as his mother, and she did not know why the angel was there at first. If she was God, she would have known. Psalm 139:4, "For there is not a word in my tongue, but, lo, O LORD, thou knowest it altogether."
Perfect peace and perfect rest
God gives us who in distress
Call and in his name confess
Of our own unworthiness.