It would seem to suggest a few things:
1) you worry about lacking the correct language to express who you are (perhaps Fe)
2) you over analyze (could be a few things, probably a T function)
3) you are concerned with what people might think and/or afraid of failure (Fe, Si)
Who knows, but ISTJ or ISFJ sounds somewhat likely to me. This should be taken entirely with a grain of salt though, as the info you provided was *ahem* a bit limited.