Not quite what I expected

I have a 1.5 or old male golden who is not fixed. He is in superb health and is very athletic. He is well trained, has excellent recall, and will do just about anything for a treat or a ball. He has lots of energy and he loves being around big groups of people and loves kids. Great with my cats now that he has learned they are not just small dogs and need to be respected differently. He will initiate play woth me especially if it is tug. So here is my only complaint about him: I feel like he is really emotionally distant. He really doesn't like affection that much. I have had dogs before and they liked me so I don't think I am the issue. Do you guys think our companionship will change or is he just a worker and not a lover?