Alternatively, as I see you play TF2, you can use the HLStats found on this site. I'm guessing you're Spy Kidz on there (as well as spykidz48), in which case your steam id is STEAM_0:0:42886166
You can also open up a console from within TF2 by hitting the tilde ~ key and typing 'status' without quotes in and hitting enter. You should get a list of players in the game, along with their respective steam ids.