Hi emmantro,
there is anyone attending the conference who could be useful to meet for the development of your research? If the answer is 'yes' I would make an effort to go. If the answer is 'no', I wouldn't bother. I think that it is always good practice to present your research to other people, but there is no point in getting stressed or presenting something you are not convinced or happy about only for the sake of saying 'I did it'. However, I wouldn't be put off by the fact that you are presenting a poster and not a paper. The problem is to present a good poster, something that really communicate what your project is about, your methodology and aims.