First of all, this is your decision, NOT your family's. You are the one going through school and working at it, not them, so they don't even get a say, unless they are paying your bills.
Second... isn't the semester about over? I'm confused, because my husband goes to school and his semester is literally over next week, it's too late to drop anything anyway. Is this not the case for you?
Third, online classes are for certain people. My husband and I have never been able to do online classes. They are NOT for everybody. It takes a certain amount of self discipline that some people just don't have. It's not wrong or right, but just be honest with yourself about what you can and cannot do. If online classes is not your thing, don't do it. It seems easier in theory, but I actually find it harder.
Last, take a breath. School is so hard, for anybody. Give yourself a break. Relax. It's not really about getting straight A's, it's about perservering and getting through it. You CAN do this.