Same for me
My aunty assumed my hair was like hers...so she used to put LOADS of greasy products on it and it just made my hair look horrible :/ then she decided to put relaxer on my hair (which...as we all know if horrific. It took me 7 years to grow out that disaster!
Most of the stuff recommended on here are good for mixed-race hair, just find your hair type. As said above, most mixed-race hair is 3b...I think mine is a mixture of 3a and 3b.
EDIT: by the way, when going to the hairdressers go to a black hairdressers rather than a white one...white hairdressers tend to bully you into straightening it!