Actually he WAS selected by a plurality of voters in the Republican primaries. Unfortunately, for us, there were several conservative candidates this time around, and our votes were split among them, leaving McCain with the largest number of votes and delegates. We, who didn't vote for him in the primaries, may not like it, but that's what happens in primaries; always has, always will.
McCain has some ideas which most would consider conservative, but he's ticked off a lot of conservatives with his ideas about illegal immigrants and campaign funding. But he wouldn't be able to do anything about illegal immigration as President, without the approval of Congress, just as he wasn't able to get campaign finance reform done without the votes of his fellow members of Congress.
Overall, he is much more conservative than either Obama or Her Heinous, so, even though I didn't support him in the primary, I have no qualms about voting for him in the General Election, because I do NOT want a Democrat sitting in the White House with Islamic terrorists looking for every opportunity to kill as many Americans as they can. I'm going into this with my eyes wide open; nothing blind about it.
Sorry, I believe you are voting for who they tell you to vote for.