What to do with my skin ?

So before i always wore foundation and powder on my skin, and it was normal, rather dry that oily. So when summer started I stopped wearing makeup , i only wear mascara now and my skin got VERY VERY oily and i get more pimples on my cheeks and T-zone. I still do cleanse and tone my skin twice a day like always , but i stopped wearing moisturizer. And I do clay masks on face twice a week or so . What is wrong with my skin ? I'm 14 if it helps .