Bitcoin is made to safely store money. People will not pay interest on this technology if they could not assure themselve that their funds are in hand. Safety will only be lost once coin you stored it in a wrong wallet specially in a wallet that has nof open source feauture such as exchanges and well known multi exchanges. The only way youll feel secure when you have the full control over your fund and there is no way the hacker could steal your key. Check out "HODLER wallet", it is an open source wallet which makes all your fund safe. Its has Back up system also that you can easily recover your key without stealing from any malware.