What can I do for a younger/more feminine face? I’m 18 years old and I’ve been told I look way older than that.

My self esteem has gotten so low that the only thing I’ve stepped outside for in the last five or so months is work and groceries. I have a very blocky forehead, undefined jaw, very defined hollows under my eyes, a generally saggy face, especially around the marionette lines, etc. I want to look like a young, feminine, 18 year old girl... not a middle aged man. It’s really destroying me. Any suggestions..?