Sometimes. 

Sometimes you dont know you're thirsty until you take a drink. 
sometimes you dont know you're horny until it's half way in. 
sometimes you dont know it's over unitl somebody ends it for you. 
sometimes you dont know. sometimes you can't see. and that's just the way it is. 

It’s me I’ve been told, wondering once more, everything before it’s not right   
Now I got that, I’ll be the first to tell you, I cant tell you.

sometimes you dont know there's sunshine until you're out the door. 
sometimes you dont see. 
sometimes you dont know why you' spent all those years with someone that hurts ya. 
sometimes you dont know. sometimes you can't see. and that's just the way it is. 

It’s me I’ve been told, wondering once more, everything before it’s not right   
Now I got that, I’ll be the first to tell you, I cant tell you.