I have a wallet through which I access bitcoins. Tell me how can you trace me since you only have my wallet address?
You clearly confused difference between anonymous and pseudonymous.
If you use private connection (e.g. VPN & Tor), follow one-time address principle and other action which prevent your identity linked with your Bitcoin, then you might remain anonymous.
On the other hand, if you do something stupid such as withdraw Bitcoin from exchange to your bitcoin address or make 1 big transaction (from multiple address where one of them already linked with your identity), then you'll traced easily.
It's different story if you privacy-focused cryptocurrency such as ZCash or Monero.