well your stats are fine.
if you mean wimpy as in no damage. ditch the shield, get power attack, use the hammer two handed, damage problem solve.
it's an either or propostion, if you want defense use shield. if you want offense, two hands and power attack.
Being a small character like a gnome really takes away from the mass damage that a paladin is known for. Most of the small character builds lean towards the lancer/mounted combat route because the lacking of a higher STR gets mitigated by all the doubling from spirited charge.
It is also favorable to the medium sized races because being a small creature means you ride a medium sized mount, and that mount can maneuver in dungeons a lot easier than a large one can.
I recommend looking into Mounted Combat, Power Attack, Ride-By Attack, and Spirited Charge, it's pretty standard, but it's effective. I'm trying to remember if there is a way to get a boost on handle animal and ride with a racial ability for gnomes, it seems like there was one, but I may be thinking halfling. Unsanctioned Knowledge is also pretty much a staple feat for paladins, but you may want to consider a rebuild on your stats for it. INT is more important than WIS, and your divine grace makes up for the negative on the save that you get for dumping WIS, and that gives you more points to play with
Your racial bonus and being a mounted charger also means you will spend less time getting hit and can afford to spend less on CON than other paladin builds.
My point buy for this character looks like:
STR 16(-2)
DEX 13
CON 12(+2)
INT 13
WIS 7
CHA 14(+2)
Other options for you are the archer-din build, but it suffers a lot more from MAD and requires basically the same stats as above, but with an even better DEX which you don't have.
If you're dead set on being a gnome paladin, my vote is go the charger route, use a lance, because it's the best damage output you can do with a small character. If you wan't to do something tanky, Versatile Human is the best race for a paladin, next to a couple of Aasimar variants.
Also mounts are cheap at lower levels until you can summon your mount, and when you can you get all your sweet animal companiony things going.
Could max out on CHA and go the hospitaler route. Though Ultimate mercy is subpar because the paladin can take Channeled Revival and only use 6 uses of LoH rather than 10. Doable at lvl 11.
Ultimate Mercy is probably only needed if your group lacks a Cleric/Oracle or your DM is both bloodthirsty and stingy with treasure. Channeled Revival looks pretty cool, but you might want to give up Channel Energy to swear an Oath of Vengeance (archetype). This will let you convert your Lay on Hands into Smite Evil.
If it isn't too late to change ability scores I'd dump Wis as MM suggests, but I'd pump up Charisma rather than Strength. Make Charisma as high as possible. This will give you more and better uses of your daily powers. If you smite a lot and maybe fight defensively a bit the DM should have a hard time hitting you. Since Kingmaker offers more downtime than many campaigns it isn't a bad idea to take a crafting feat or two. Craft Wondrous Items can halve the cost of Silver Smite Bracelet as well as ability boosting items.
By the way, I hope your "Chile of the Temple" is tasty (you've got a typo in your traits)
