Because, like a diamond, we are with many facets. It is the varied interests that make us well rounded individuals. Without this variety, we would be at home with, or appeal to a very select few.
Develop to your best in each category. Some catergories will likely show more 'natural talent'.
Just for examples.......
You may have an interest in writing, cooking, sewing, pottery.
Your efforts in cooking may show more consistently positive results than pottery. You should develop and encourage cooking, yet still allow some pottery work as a hobby.
You may have a natural talent for writing and like to sew, where your talents are not as developed. So, write to your hearts content, and stick to simple sewing patterns.
You need not strive to be a best selling author, have a cooking show, sell custom made pottery and have fame in fashion design to be yourself and enjoy your days.
Variety is the spice of life. In your 30's, you likely have a lot left to discover about yourself. Perhaps, you are rearing children, and your passions have been put on hold.
I am a big fan of letting life unfold.......