Okay kid.
You can do TWO things here.
If you have a family computer you could create an alternative sesion in the same computer.. apart from Administrator. To do this you could go to Control Panel/ User/Create user... That way instead of sharing sessions you'll have a personal one and you can make it private... Well depends not so private but a bit more private.
If you just want to delete the HISTORIAL, it depends on your Browser, AKA: explorer, safari, etc. Which one are you using?
If you go to content on EXPLORER and hit AUTOCOMPLETE, just don't check the boxes that say: WEB ADRESSES, FORMS, etc. and save... Also delete historial... You can do the same on firefox and safari but I don't remember when, just look for it on tools.
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Dance. Gunna be okay(ooh). Just dance.
Spin that record babe.Da-da-doo-doo (oh yeaah)
Just dance. Gunna be okay.