How do i get through this issue?

Im 20 and four months ago i found out about my birth mother.Yes i was shocked and felt bitter.My bitterness came from me gripping reality.My brith mother has no memories of me as i grew.The birthdays were not celebrated with her on my shoulder saying make a wish.Christmas was not given justice due to her being i suppose content knowing she was suppose to help me make cookies.I have come to the realization that my mother may not be the woman i hope for.We have had contact via facebook and by phone.I am taking it one day at a time.I need advice on how to go about developing a relationship with her?.I want to have a great relationship with her.Any advice will be helpful.Im a adult that yearns for her love.