It isn't just about you either. I have a right to have my Conservative beliefs represented, through my vote.
Your less-Conservative beliefs (less Conservative than mine) become problematical for me, in that if the GOP keeps moving to the left/center and keeps getting elected, then they feel that Conservatives are approving of their policies, and there is nothing to keep them from moving even more to the left.
They'll reason "hey, people keep electing us, so they must approve of what we have been doing".
If we don't make a stand now, we risk the future of this nation being turned into another second or third world socialist mess. Sure, I'll be dead before it happens, but I don't want my grand-children or great-grand-children to have to deal with it then, because by then it's liable to be too late.
You can see me as a problem and I can see you as a problem, and maybe neither of us is right, but oh well, we are just going in circles now.
I often use the phrase "It's the voters, stupid" because the voters are the ones who put the politicians into office and directly (in some states) and indirectly elect/appoint people to the Electoral College. When the voters want more conservatives in government, they will put them there. Same thing with big, unlimited government....when the voters don't want it, they will vote for those why will change it. It's not complicated.