Nothing wrong with an FCR1 and as you will find on the century ride- There will be people on bikes a lot less suitable than the one you have. All an FCR1 is - is a road bike with straight bars- Ok not a top end one but a $1,000 road bike will not be better than the bike you have.
So you have the bike and you have been riding for 3 months. 3 months is not long enough to say you are fully bike fit yet. Get more miles under the belt- or start doing harder rides. Get a few hills in- Get a 4 hour non-stop ride in or get up to 50 miles gradually. You will get there if you train but don't change the bike----YET.
__________________
How long was I in the army? Five foot seven.
Spike Milligan