I think StyleCommander you need to think this through a lot in terms of your partner. If he does not want any more children what would that mean for you and the child if you were able to adopt (I feel sure you would not be able to if your partner is not on board) but anyway .... Your partner might want to go out for a drink or meal in the evening, but you are 'stuck in' with your child. It may be a long while before the child feels safe enough to be left with a babysitter.
Babies, toddlers and older children do not just exist in a small space, they stretch out and take over! Quickly you find their toys all over the house, their clothes all over the house, their TV programms on TV! It just happens and although some people I know manage to 'contain' them to some degree, they just spread out! So the adults in the house need to not mind CBEEBIES on TV (sometimes) and not to need too much peace and quiet. Even if you are caring for baby's needs, your partner will now they are there and although you may hope they will get drawn into the world of the baby/child, and they might they may also not get drawn in, and could end up resenting the child for changing your home and your relationship.
What about the child's feelings living in a home with one parent who wants them and one who does not? Already feeling neglected and rejected (possibly) having lost a birth family and at least one foster family how will they feel if their new family does not 100% want them.
I do not think this is anything about your being a male, or a male couple, it is about adopting as a couple you must be on the same page together. This may well break up your relationship and you may be left choosing between your partner and your child.
Sorry if that sounds hard. You are young and you have a lot of life ahead of you I am sure. I think you need to choose/decide what you really want and maybe things will change and your partner will totally change his mind, but if he does not change his mind you can't change it for him and it would be unfair to you and him and most of all to a child to bring a child into a home where they were not really wanted by both parents.
Good luck and really truly hear me when I say you are young, you may find life changes and you can adopt up to about age 50 plus so you have plenty of time to be that dependable person at a stage where you are in the right situation for it to happen.
Could you get child care experience now to help you later, and be dependable for someone, some kids who need you? A mentor for children with Asperger's or gay teenagers etc? You obviously want to give a lot and you will be able to find a whole host of ways to do that, and you have plenty of time to work out what is right and when.
For what it is worth I desperately wanted a baby at 17 but actually became a mum for the first time at 39. I do not now regret waiting, I had more to offer at 39 then 17 (no offence to anyone who became a mum or dad at 17!).
Bless you.