Preferably a marshmallow breed, such as a golden retriever.

At that point, all you need to do is treat it decently, and you will have almost unconditional love.

If you need to be loved by a person, well, that's more difficult. Since it would be way too cynical to suggest one could succeed only by totally subsuming one's personality into what one thinks the person from whom one needs love desires, I think I'll pass on the human aspect.

Get counselling to eliminate the need for a person to love one, and get a dog :-)