If you're looking for a straight forward answer about whether to watch this movie or not...Don't ! Really not the best way to waste one and a half hours of your time.
The genre might say comedy/teenage/coming of age movie but it's just very 'teenage'. From very early on in most movies the audience can predict if the movie is going to be good or worth their time and that is basically what happens in this movie as well i.e you'll know it's going to a waste of time.
It tries to be funny but it just fails quite miserably most of the times.