Help with Fasting as a Christian

I just started fasting for the first time to get closer to God. I decided I wanted to do 3 days of just drinking water. It's been a day and a half of fasting (so like 30 something hours) would it be bad or shameful to end it quicker than I had planned it to be? My parents also tell me not to fast for that long because they say it's unhealthy. What should I do?