How I take things so literally

I don't know if anyone ever have the same problem as me, but I think I have this problem of taking things literally. Like, I tend to listen to what people say to me literally. 

For example, when a friend says things like, "I hate you" to me when they don't mean it, probably they're just joking with me like that, I would still think that they hate me and then I'll start wondering why they hate me. There're a couple of times when people asked, "Hey, what are you doing now", they actually meant like, what I'm studying now, or you know, what I'm up to currently. The "now" that they meant doesn't literally mean "now" but more like currently in the long term. But I tend to interpret their questions so literally, so for example when they asked me and I'm in a shopping center, I'll tell them I'm shopping. Then they'll be like, "No, I'm not really asking what you're doing "now" but what you're currently doing, like what're studying, what course are you doing?"

Do you get what I mean? I take things very literally. 

I remember when I was in primary school, there was a test and one question asked us to draw a family tree. And guess what? I drew a tree. Ya, literally a tree! 

And then my friend got so shocked like that, she purposely slipped a note under my desk and wrote, "The question told us to draw a family tree, like this: 

It's not like this: 

No need to really draw a tree!! "

That's what written a note, I think. Pfft, now that I think back, I was so stupid. 

So I don't think I take sarcasm really well. I don't even know when you're being sarcastic, haha, so don't try to be sarcastic. I'm too dumb to understand ok.