To go into more details, the only RPGs I've played are Fable: The Lost Chapters, Oblivion and of course Skyrim and I'm very certain I had played Hexen though it was so long ago I barely remember it. Most of the games I have these days are not RPGs and are fairly old, but they don't involve companions (save for one, but I've been playing it since I was a kid) and the reason why I dislike having a companion is because I have to watch out for them, level and gear them up, among other things. More than anything I feel as if they would just get in my way and give me a hard time, along with how they might attack when I'm not ready or simply be a bother to me.. I've seen people complaining about Cicero in Skyrim for not being useful the times I've peered in there.
Basically I'm not used to any kind of companion because I grew up with games where it's just me, and then when it comes to games like TES I simply don't bother to try to find any because I'm happier without them.. I've also only played one game from Bioware so I don't know anything about Mass Effect, Baldur's Gate or Dragon Age.
With all that said.. would a solo gamer like me enjoy DA:O, or should I just find another RPG?