Yeah theres no model for Gordon Freeman in HL2 Simply because theres no need for one. You're in first person the whole time, so theres no need for yourself to see yourself, and it would ruin the whole experiance of the game if you could see your in game persona.
Theres however a new Source engine updated Freeman in HL:Source if it makes you feel better.
Theres however a new Source engine updated Freeman in HL:Source if it makes you feel better.