Me and my dad cant get along at all I try but he keeps on yelling at me I love him and want to have a better relationship with him but we both keep messing up also my step mom is getting in the way by acting like my real mom witch drives me nuts.

You need to tell him how you feel. That is the therapist inside of me.

Maybe you should do the unexpected(whatever it may be.). You also just have to endure your step mom, telling your dad how she makes you feel may make it worse.

you should spend a day with your dad and go do something you both enjoy. Talk to him about everything and let him know how you feel. If he is still around then you know he loves you. If your dad still doesn't understand after you try talking to him, its not because he's a bad person its because he is a bad parent.