You can use the Weapon Finesse feat to apply your Dexterity modifier instead of your Strength modifier to attack rolls with a rapier sized for you, even though it isn’t a light weapon for you. You can’t wield a rapier in two hands in order to apply 1½ times your Strength bonus to damage.
| Range | Damage | ||||||
|---|---|---|---|---|---|---|---|
| Weight | Cost | Damage | Critical | Increment | Type | Special | |
| Rapier | 2 lb. | 20 gp | 1d6 | 18—20/×2 | — | Piercing |
Source: Player’s Handbook (Page 120)