All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
Marital life is an edifice that should be based on sound foundations, starting from the right choice, that is to say, choosing a man who is religious and has a good moral conduct, as the Prophet said, "If a man whose religion and moral conduct are pleasing to you proposes to you (i.e., to marry a woman under your guardianship), then let him marry." [Ibn Maajah and others]
Also, the conditions of a valid marriage must be met in marriage, the most important of which is the consent and presence of the guardian. According to the view of the majority of the scholars, a marriage without the consent of the guardian is void. Please refer to fatwas 83629 and 84811.
Now, if we look at your marriage, whose bitter fruits you are now reaping because of not observing those foundations, then we find that it was built on an illicit relationship, and it is forbidden in Islam for a woman to have such a relationship with a non-Mahram (marriageable) man outside the framework of a valid marriage. Indeed, it is forbidden in Islam to take boyfriends, as Allah says (what means): {….nor those who take [secret] lovers.} [Quran 4:25]
On the other hand, your marriage to that man took place without the consent of your guardian; this is not permissible in Islam and the marriage is not valid, as we have already mentioned. Therefore, it is a void marriage, and the separation must be made either by an Islamic judge annulling it, or by any authority that may act instead of the judge, such as Islamic Centers in non-Muslim countries, or that your husband divorces you. So choose the alternative that is possible for you. It is not permissible for you to marry another man before this marriage is annulled [by divorce or a judge or an Islamic Center].
For more benefit, please refer to fatwa 92478.
You do not have to tell your parents about what happened, and it might be better not to inform them, as there is mostly no benefit in doing so. However, in the future, you must abide by the Islamic conditions, among which is that your marriage must be conducted by your guardian.
Allah knows best.