my relationship with my parents was always strong untill the point when I felt ashamed and scared to tell them.
Chica, at one point you shared a strong relationship with your parents. So there must have been qualities in this relationship that made you perceive it as strong. Know what I mean? We don't refer to a relationship as strong if there's no solidarity to it.
So try to remember and focus on those qualities that made your relationship with your parents strong. Was it trust? Was is emotional support? Was it ease/comfort in communicating? Maybe that can help you get back on track.
You then mention that you started to feel ashamed and scared. What caused you feel this way? There have been times when MANY OF US have felt that our parents will have a strong negative reaction to something we tell them........only to be surprised by their strength and understanding. In other words.........sometimes our assumptions about others are self-created. We assume that a person (parents, sibling, friend, spouse, coworker, boss) will act in a certain way...........and sometimes our assumption is correct............and other times they are completely wrong.
So reflect over what makes you feel that your parents won't understand. Was it something they said that makes you think like this? Or is it your own fear and perception about your parents?