Jeez, 19 and he'* got an SSEi. Lucky bastid...
Welcome to the Club man!
You kind of got the backwards intro. Most of us started with an SE or an early nineties Bonnie, then moved up to SSEi'* and GXPs. Don't worry though, if you decide to mod, you'll quickly be leaving your old man in the dust...
Check Techinfo for common problems, and fish around in Performance and Brainstorming, and in 2000-2005 for performance ideas.
Basic first mods are usually a Cold Air Intake(CAI) or FenderWell Intake(FWI), 180* thermostat, smaller */C pulley, and a reprogrammed PCM. These will net you a noticeable increase in power, even if it'* not a hellacious jump. After that, your options expand alot, but these mods are the best foundation for later big-power mods.
BTW, if you drop your year and trim level in your signature, it'll save you some time when you're asking questions.