If you want to have a sense of existence, you have to be excellent. When you become good enough, many people will want to be around you, and your good friends will set their eyes on you, so that you can have a sense of existence.
You can become excellent in all aspects, or you can specialize in one aspect, which makes you particularly excellent in this aspect, such as keeping your skin white and tender, taking off your clothes to exercise, keeping your hair shiny and smooth, and wearing clothes with good taste.
When you have a good experience in skin care, slimming, dressing, hairdressing, or whatever, then you have something to attract others' attention. If they want these things, you are valuable to them. When you have value, they will all come to you, and your sense of existence will come. You can't do it if you don't want them.