Working out your skin type

[bonfireheart]

Sounds really obvious but how do you work out what skin type you are?
For example if I don't use any products my face gets dry especially around my nose

and forehead. So do I have dry skin?
Yet I often get spots on my cheeks and chin. But it isn't oily. So do I have acne?
I have scars/marks on my face from the spots. So do I have combination skin?
No matter what skincare or makeup I use it make sure my dryness and spots worse. So does that mean I have sensitive skin?

I really need to improve my skin but I don't know where to start because I don't even understand my skin type. Really want to try the Ordinary but that's like a science based on your a skin type!