I don’t want a dog but my feelings keep getting in the way

This is sort of messy because I'm emotional. Sorry about that, but I did try to make it into something somewhat readable.

I am a teenager that was "gifted" a dog not long after the previous family dog passed away. I was not over the death of the previous dog, and I did not once ask or imply that I wanted any other animal. It was a complete "surprise" from an aunt.

I've had him for a few years now. This dog, however, is not a family dog. This is my dog that I am 100% responsible for. A dog I never wanted and still do not want. It's a weird situation to explain, but everyone else loves the dog so much that they won't give him up, but they also will not do anything for him? I'm doing it all on my own. I have no one to rely on, which also means, that when I do eventually give this dog up, I don't know anyone personally that can take him.

I understand that the logical thing to do is give him up to a shelter when I have the opportunity, but I really do love him. On the other hand, he just stresses me out to no end. He will howl and cry if I'm not with him, even if I'm just in my room. He is so picky about his food. And as I mentioned earlier, I have zero help. I can't get him groomed because I have no money, so I have had to learn and keep up with dog grooming to keep him comfortable and presentable. I try so hard to cherish him but it's too much. He is so cute, he's fluffy, he's sweet to everyone even if he barks and hides at first, he's so happy to see me, would not bite anyone even if his life depended on it, and he is honestly such a wonderful guy outside of the negative things I've said, but I HATE owning a dog. This is the reason my original plan before this was sprung on me was to not have an animal at all.

What I'm saying here is that I don't want an animal but I have gotten way too attached to feel like I can let him go, even though I know there is someone out there who can treat him much better than I do. I don't always treat him like I should because I never wanted him in the first place. Not an excuse, I know.

I have to give him up for my sanity, really. I'm so overwhelmed, I can't do this for another decade (at least). I guess I'm asking for advice on how I'm supposed to detach myself. How am I supposed to give him up when I love him so much?