It would be prudent to get divorce before moving forward. This will terminate the nikah if it was valid and will not do any harm if it was invalid.
The Hanafis recognize as valid a marriage when you are an adult and its with your consent, so according to them the marriage will be valid and obviously you would need divorce.
The rest view the marriage as invalid when the consent of the wali (guardian of the woman) is not present, however they may still require divorce before you can remarry, this is the view of the Hanbalis.
From Mughni by Ibn Qudaymah (Hanbali fiqh), translation partially taken from IslamQA:
وإذا تزوجت المرأة تزويجا فاسدا ، لم يجز تزويجها لغير من تزوجها حتى
يطلقها أو يفسخ نكاحها . وإذا امتنع من طلاقها ، فسخ الحاكم نكاحه
If a woman gets married in an invalid manner, it is not permissible
for someone else to marry her until she is divorced or the marriage is
annulled. If he refrains from divorcing her, the ruler breaks his
So again, the best course of action is that you take divorce.