I also consider myself a gay male, I will be going on T and having top surgery and getting all the inside bits taken out. But as for the actual vagina, it can stay. I'm not bothered about having a penis, I think at this point I would actually miss what I have now if I miraculously woke up with a penis one morning.
I'm not particularly interested in penetrating anyone, other than being curious about how it would feel. I'm very much a bottom in the bedroom.
My current partner has also shown me miraculous things can be done with my current plumbing

so I'd miss that if it was gone
The one thing I would want a penis for is peeing standing up, I've never been able to get an STP to work all that great so I always just go ahead and use the stall when I go to the bathroom which isn't ideal, but meh, doesn't affect me all that much, I tend to avoid using public restrooms anyway, regardless of the trans issue.
Someone mentioned that not having a penis will cause you massive problems in the gay community, I'm certain that isn't true. It totally depends on the person. Sure if you are the type who goes to the seedy gay bars where the main objective is to hook up with someone in the bathroom then you're probably going to run in to problems. But the gay community as a whole isn't going to totally reject you for not having a penis.
I've dated a fair bit while presenting as male and when I've told them what I have in my pants it's generally been met with "oh....ok...fair enough!" - maybe a few curious questions but never disgust or rejection. Straight women I've hit on have not been bothered either (experimenting, decided I didn't like girls after I tried it

)
Straight men I've had issues with - but that's from them hitting on me thinking I was a girl, they wouldn't have bothered in the first place if they knew I was a transguy. It's more a reaction of "oh, you're a dude? we can't get it on then? *huffhuffsulk* c'mon I can make you feel like a woman! got a vagina right? that'll do!"
Lesbians have also gotten a bit nasty with me after I've said I'm not a lesbian, I'm a transguy. Lesbians seem to hate us o_o like we're betraying the sisterhood
I'm aware this doesn't apply to everyone, but this is what I've experienced