You know, the only way to put your mind at ease of your over worry about security matter on the exchange is:
+Get to the best exchange as possible to reduce the risk of exchange got compromised
+Get all the security option for your account on that exchange ( 2FA, phone code verify, IP-browser,... heck, turn on anything they have)
+Make sure your email also has the same security, you don't want hacker get to your account by your password of 123456
+Try to make a second PC workplace and smartphone for business only and another one for playing vidya, leisure activity, porn and such.
If you had gone thru all of the above already but still feel insecurity then you are really need to see the therapy.