Alicia Keys “didn’t value herself” for years. The 41-year-old soul singer – who shot to fame as a teenager and released a of chart-topping albums in the late 1990s and early 2000s – admitted that during her younger years she struggled to know her own worth but these days has learned to see herself as a priority in order to be more “productive.” She said: “I value myself now, and I think for a lot of years, I didn’t. I learned that in order for me to be the most productive, I have to be well. I now prioritise myself in a way that I just didn’t [before].” The ‘New York’ songstress – who in recen…