Everytime I go and look at my steam ID page, it says that I have played some hours of half life 2 (you can see in my signature)
But I don't even have half life 2!
Does anyone know what's wrong

the steam community is abit messed up because l4d

Perhaps your playing half-life 2 mods?

This has been happening to me as well. I noticed my time in HL2 to be almost identical to my Source SDK time. I think that using Hammer makes the HL2 time go up for some reason. It may also make the Portal time go up. I think it's just caused by using Hammer.