Gahara7, I second what Argonautomobile writes, but I'd also like to say that in my experience a therapist will not tell you that you have to inform anybody else in the world that you're in therapy. It might depend on how old you are, if you are a minor and still living with your parents, and whether you'd have to pay for a therapist (I have no idea what the system is like in Greece, I'm afraid...) But I'm sure the same laws of confidentiality apply, so the decision about whom to tell, if anybody, is yours - even if the therapist should have an opinion on the matter.

Not everybody is helped by therapy, but many people are, and perhaps you couldn't lose very much by trying it out? For me, it took a few tries with different therapists before I found one I could work with, and I think that's also fairly common.