Trying to talk to your parents from the other side of a closed door must be hard enough without also feeling like they care more about their business than their daughter. Their behavior doesn't necessarily say anything about how much they love you or believe in you, however. So my advice is to try and find out what does explain their behavior.

One way to do that is to talk to them about what's going on--without a closed door between you. Maybe you could invite them to sit down with you in a new place or in a more structured way than you may have before. Whatever it takes to make this particular conversation feel special and different from others.

A calm, simple explanation of the ways you are feeling neglected might get some kind of reaction. If it doesn't, you could try writing it down for them. Your words could take some time to sink in either way but you should also be prepared for some denial. It may be hard for them to face the fact that their priorities are making you unhappy.

On the other hand, who knows what you'll find out. You may gain a better understanding of what they are so preoccupied with.