The 33-year-old was named the club's player of the year last season due to his performances at centre-half but has been deployed at full-back this term by manager Mark Hughes due to injuries to Armand Traore and Rafael.
But, after being given a torrid time against West Ham and then being replaced by Traore at half time during defeat to West Brom, Hill acknowledges the demands of the position are too much for him nowadays.
“I’ve got to that age now where I know my limits,” Hill told West London Sport.
“I’ve been punished a few times because my legs won’t get there at this time in my career.
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“I’m trying to do a job because we’ve had a few injuries with Fabio and Armand. He’s come in so hopefully he’ll be alright now.”
The Rs head into the international break bottom of the Premier League with just two points from their opening seven games, but Hill rejected the idea that the influx of new players during the summer is the cause of the club's poor form.
“I don’t like using that as an excuse. Everyone plays football no matter what league, language or country you come from," he added.
“There’s still the same white lines, ball, a goal and 11 men. It’s very frustrating because if you look at the team on paper you think you should be higher.
"We’re surprised where we are, but there’s no given right that we should be any higher. The league doesn’t lie.
“We haven’t performed to anything like the standards we set in pre-season. I don’t know why that is – it’s just not going for us. All we can do is regroup and go again.
“The higher you go the more you get punished for individual errors and mistakes. As soon as we cut them out I think we might start getting decent results.”