Yes, legally and commercially you don’t own it. Creatively, I will assume you did pour a lot of heart and soul into it, as ad.mixx describes above. To me, that matters most. Also, like I said earlier, I am not a pro (ie. don’t earn money with it), it’s just a hobby and it doesn’t make to have money and I don’t have to sell it.
I’ve found that the pro/commercial perspective changes the whole outlook on things severely. If it’s just a hobby, you can get away with just doing what you feel like (within legal limits of course), simply because enjoyment is the primary concern, rather than the financial/legal aspect where it’s more like a job and less about enjoyment and self fullfillment.