Is my girlfriend fed up with me?

We've been together for almost 3 years and we've never had a major problem until a few months ago. She's about to graduate High school and is about ready go into college. Lately it seems like she's been distant and can't seem to find anything to be happy in. I'm a bit immature at times but its usually at times when she needs a reason to laugh, but lately its been getting on her nerves. Its really affecting us.
Is my girlfriend fed up with me?
Post Opinion