I'm trying to sync all my contacts from my HTC Desire HD to my google account but I can't see them anywhere in my google account. I have already found several tutorials on the the internet but still can't make my contacts visible in google account.
You can do this the old-fashioned way if you want to do one-time sync only:
From the desktop you can add and edit your contacts much more easily than you would on the phone. However, I found syncing to be unreliable sometimes, especially with HTC Sence (I had the stock ROM previously on my HTC Desire) -- I had to deal with duplicate contacts and mysteriously vanishing phone numbers on a few occasions.