Take my advice...visit
www.bikefitting.com, find your nearest participating bike shop, get along and get yourself properly measured for bike set up, it'll be the best £35 you ever spend on your bike.
I found out I was on a bike that was too small for me, some adjustments were made, new stem, higher seat post, which made a lot of difference, ultimately I went out and purchased the carbon dream machine I had always lusted after.
The dealer
AW Cycles refunded the cost of the fitting against the cost of the new bike, so the fitting was free, result I now have a gorgeous Wilier Mortirolo carbon framed bike, with a sexy Campag Centaur groupset, that fits like a glove (well bike actually!)
Set to my style of riding sport/fitness, which means I can ride the bike efficiently and in comfort.
IMO certainly worth the time and cost.