Giantism (3.5e Trait)
From D&D Wiki
You possess a rare gene which causes you to be much larger than most members of your race.
Prerequisite: This trait is genetic; you are born with it. Therefore, it must be taken at 1st level.
Benefit: You gain all the benefits of being one size category larger than what is normal for your race (better bull rush, grapple, overrun, & trip checks, attributes, use larger weapons, and higher lifting and carrying limits). The statistics of attributes are set for in the table 4-2 in the Monster Manual.
Drawback: You suffer all the drawbacks of being one size category larger than what is normal for your race (worse armor class, attack rolls, Hide checks).
Roleplaying Ideas: You can pretty much play this one however you want. Your character might be sensitive about it, he might be proud of it, or he might be indifferent.