It was hacking attack on the website where crypto currencies were provided for cash.
The internal database of this website on their servers was hacked  and private keys and adresses for more customers were stolen.
I bought bitcoin for curiosity only for 3OO dolars - it is nothing by comparision  to people whose bought over this website bitcoin and other crypto currencies for 50K dolars and more.
Have a nice day

Thanks for Your reply
It was hacking attack on the website, where I bought bitcoin - I figure it out a few minutes ago.
Web site where I bought was running for 4 years without problem.
I knew that I paid extra fee for bitcoin, as I said I bought it only for curiosity in order to find out how it all works ....
Thanks all for their reply
Have a nice day

Okey
Once again I am saying I have no idea how all this crypto currincies world works.
I bought bitcoin only for curiosity.

This is all transaction

https://blockchain.info/address/1LXpdgJzoAVBYw81k3VmqFZzcDXreTfgvK

Hi all
Thanks for your replies.
I am just going to contact web shop, where I bought bitcoin.
And because only this web site has my private keys and adress on their server, I propably suspect who stolen my bitcoin because I made no transaction with my coin during the week.
If I dont get back no reply from them I will publish the web adress of this e-shop.
Thanks for Your reply
Have a nice day

Hello everyone
First of all, I would like to say that I am an absolute newcomer here, and I have little idea how the world of virtual currencies works.... About a week ago I bought my first mBTC for $ 3OO. I got an address and received a private key on the email and when I looked at the blockchain one week ago, I saw there ony one transaction of $ 300 . During this week, I did not send my $ 3OO to anywhere, nor did I enter my private code into any application. When I looked at my blockchain address yesterday, I saw there two transaction and my address has now 0 bitcoin. Could anyone please tell me if someone stole my bitcooin or what happened ... And if I still have my private key, can I ask for my bitcoons back?
Thanks