Lunette, don' frighten yourself. If you're getting up to your early to mid twenties you might be in the process of expanding mind hence your brain is always gonna want a Rubix Cube to play with.
Not to scare you but around this age some people fall into schizophrenia HOWEVER sz is not nearly as bad or rotten as TV's villains portray so it's not like you would go raving mad and have to be shackled to a wall or anything ridiculous like that.
And once again, this is just coming from the perspective of an sz you probably won't even have to worry about but it is critical during this time in life that you get plenty of proper rest and normal hours.
I'd also kick back from caffeine and any other stimulants that get your mind to exercise itself too much.
Hang in there, sweets. Things can get bad but never as bad as your worse fears or what you dread them to be. =)