Unless you have exclusive control of your private key then you don't have any bitcoin. I'm afraid it may be very hard to figure out what website has the bitcoin wallet you are looking for. Whichever site it is may also require you to remember any password or pass-phrase you set up.

In any case, there is no money in that wallet address.

https://blockchain.info/address/3GJpkncAspXwChe5suBkWEk8uWbFRfohpj