Feeling envy because other people do the same thing as you do but "better", because they have more subscribers/users/engagement, I would describe as a rational feeling.
Should you stop working on your thing because of this? Sure as hell no. Learn from them. In the end you may have a similar end goal but it's most certainly not identical because your entire background is different to that of other people which means you will arrive at different conclusions. What will be important for your thing and what the other person feels is important for their thing are most of the time apple and oranges. So don't feel discouraged. Actually feel good because now you have a new source of inspiration. Let them inspire you but don't just blindly copy them out of "envy rage".