Presumably if you're an undergrad you're an adult? Part of growing up is learning to make your own way. You family were the people giving you direction as you were growing up and now you're on your own - you decide what's good for you and take the responsibility to explain your decisions. It's great if you can still get advice from your family, but if you don't think it's good advice that's fine. Everyone goes through this phase. It's particularly hard in the beginning, when you're just starting to make your way in the world, but it gets better with time. Listen to your family, make an effort to explain yourself and also be very clear with yourself and with them about where the line between their giving advice and your deciding for yourself passes.