This year has been a year of awakening for me. I've realised how wrong I was and how away from Deen I've been. I'm trying to correct myself as much as I could. I've learned that we should keep away from all the materialistic things that belong to the world. I no longer use phone for chatting with my non mahram friends. I however, have a hobby of photography. I post pictures on social media and I like when people like my posts. Should I stop doing it because it is also a worldly thing?

No. You do not need to stop that, provided that you do not capture and post bad/ sexual pictures.