No, I dont think your a drama queen. I think you've legit reasons to feel upset, really good reasons.

Am sorry that you've had a tough time with your mum all your life, and that your dad's let you down at times. I guess you've felt alone at times, and when your pop treats others better than you, must make you feel alone again. Have you tried asking him why he wasnt there for you? Perhaps letting him know how his actions have made you feel may change his ways, and make him become more thoughtful. If not tho, sometimes with parents you may never hear what you want to hear (its true of my parents who I do not see) and you may just have to either accept your dad and his ways, or keep away for a bit while your hurting.

Big hugs x