You feel so guilty because obviously your dad
choose to saddle you with the responsibility of leaving by making you believe he left because of you (being gay).
You feel guilty because he most likely did a lot of shit and say '
See what you did?'.
He was an abusive drunk and he most likely blamed you for a lot of stuff that went wrong in his life because he couldn't or wouldn't take responsibility for his own actions.
Abusers often rely on the '
see what you made me do?' when they abuse their victims. The abuse is not their fault, oh heavens know, the victim made them do it.
Victim's guilt is typical of the situation. Survivors of Abuse learn how to at least cope with the guilt, if not actually start disowning their 'responsibility' to the actions and behaviors of the abuser. Victims of abuse refuse to take any action to change how they feel about these matters and remain victimized well after the abuse ends.
How do I know - been there, did that - and I did that over and over again.
Grandma, Grandpa, Mom and whoever else who are not accepting you as you are making their own choices. Yes you are gay, that does not give them a free pass to treat you like crap. They CHOOSE to treat you like crap and they are using your homosexuality as an excuse to release them of proper social behaviors (civility, kindness, love, whatever).
This is NOT your fault. Its not like you woke up one day and say 'Women, who needs them - I think I will go find myself some Homosexual Sex!'
You were born this way. You didn't have a choice in that.
Yes there is a lot when it comes to homosexuality you do have a choice in. You can choose to be promiscuous, you can choose to wear a condom or not
(thus run the risk of STDS) those are choices.
You are a Victim of Abuse. Currently. I want for you to figure out a way to stop being a victim and start being a survivor. One good way is to seek professional help: Psychologists (Therapists/Counselors) is usually a very good way. They typically do not have a MD thus do not prescribe pills.
You may have to shop around a bit to find the right therapist. After all you are dealing with people and this relationship of Therapist/Patient is as personal as a relationship between you and a potential lover. So you may have to talk to several therapists before you find one you are comfortable with.
Honestly, without knowing the particulars of the abuse and the home situations I have no idea what sort of tools you need in order to cope and work through the stuff on your plate. I suspect there is a lot more than merely guilt at work here. I suspect you may also have a little PTSD and all of this other crap mom, Grandpa and Grandma are piling on you could be working a minor PTSD into something a bit more major.
IF God/Faith is an issue for you, there are resources there as well. There are 'gay affirming Churches' - which means churches who accept homosexuals as being yet more precious gifts from God (like all souls are).
http://www.gaychurch.org/find_a_church/f...church.htm is a directory, most likely there is a gay affirming church in your local area.
If Faith/Religion is an issue, I strongly suggest finding one of these and speaking with the priest/minister/pastor/head high guru. S/he will most likely be able to start you on a path of discover of the alternate interpretation of those 6 scriptures constantly used to beat up homosexuals. S/he may also help you find ways to slowly change the minds/opinions of your family - depending on how open your folks are.
Further, most Ministers/Priests/Pastors/Head High Gurus also come with a bit of psychological training and are able/trained to provide some counseling. If not, they most likely will have resources, lists something to help you to find someone to help.
If you ever need a person to scream at, cry on, rant at, or to ask any question that you need an answer on when it comes to abuse/victimization/homosexuality/God feel free to PM me. Whatever it is I know I will share and what I don't know I can at least give suggestions on how to find an answer.