Can you post a link to a game or games you played as Taric? Can't really see what you are currently doing without it.
Anyways, I find that Taric scales well into the late game and is a jack-of-all-trades early. When I play Taric, my usually build is as follows.
Items:
Masteries: 0/15/15 or 5/22/3
Runes: Flat Armor Marks, Scaling Armor Seals, MR Glyphs, Health Regen/Flat Armor/MS Quints
General Skill Order: EQWQWW, R>W>E>Q
Taric doesn't provide as much utility as other supports late game, but if you weave autoattack between abilities you can serve as a powerful bruiser. You can fight a lot of champions equally while also providing AD, AP, Armor, and MR auras, slows, heals, and stuns.
In team fights, I find he best serves as a bodyguard for your carries. If anyone tries to dive your carries, you stun them and start killing them while absorbing damage.