Is my hair in bad condition?

I am so tired of dealing with my hair i do not know what to do...everyday i have school and i work and i am always late to both because of my hair, it is really curly and i had alot of split ends..so i invested in a good scissors and cut them off myself...most of it is gone but i still have alot..i cut so much of much hair because of spilt ends and i still have..what is this mess? i bought some human hair extension to add to my hair because i hate short hair and i am having trouble blending my real hair with the human hair because of the different texture...it is so frustrating...the only way to blend it in is by straightening my hair and i cannot afford any more breakage....is there a way to really curl the human extensions..i have tried a curling iron and still that does not work...help me please