Sometimes I give myself the creeps,
Sometimes my mind plays tricks on me
The singer might be stating that he feels that he is mentally psychotic and he thinks that he has gone crazy because he is seeing things, or he just doesn't know if he's crazy or high/stoned/drunk.
The singer is implying that some Americans are idiots and that he doesn't want to be like them. Disclaimer: he's not saying that necessarily all Americans are idiot, just that some of them are.
