How can I let my boyfriend know that I feel unappreciated?

Sounds to me that you two need to have a talk. Communication is the most important part of a relationship. You should fee that you can talk to your mate about anything and everything that you wish. If you are feeling unappreciated, then he needs to know that. He might not have any idea that you are feeling this way. After all, he is only a man. ( no offence guys! =) ) He is not a mind reader and this will only get worse as time moves on. Ya never know.this could even work out to your advantage.He just might realize what a good thing he has and just might step up and start doing special things for you.Good luck! =)

You answered your own question:
you talk to him.
tell him about the problem
and chances are,
he'll understand

Talk to him. Tell him how you feel. The truth is the only way to do it. If he does not respond. leave