Where is an "I'm an INFP and proud to be one!" emoticon when you need one?
Seriously though, if I believed that changing 4 letters would change who I am, I might consider being another type, probably an ENFP or ENFJ. They don't seem to have as many 'negatives' attached to their description. For an INFP, even the 'positives' such as being truly a Mr Nice Guy comes with a "Nice guys always finish last". I think it's normal for an INFP to feel that the grass is greener on the other side.
But life alas doesn't work that way. That shouldn't stop anyone from improving who you are though and working on actively using any of the 8 cognitive functions.
In the end, you are who you make yourself to be, not what 4 letters of the alphabet say you are or are not.