Congrats on your first 50 subscribers!
When I got my first ONE subscriber I was probably the most excited human being on the planet, and then it must have taken me about a year to get to my first 100 subscribers. Obviously this was a while ago now as I've managed to be lucky enough to get to over 1,000, but it just made me feel as if someone accepted me for who I was. I was never a popular person in my childhood. I got a lot of bullying in school etc... and so the thought of getting my first 100 subscribers when I did was quite overwhelming. This must have been around 2011 time, almost a year after I started my first YouTube channel.
Since then, when I created my new MrYorkiesWorld channel, I was shocked by how fast I gained subscribers, but I think that excitement sort of faded, since I'm 23 years old now and I was only 16 or 17 or something like that when I got there before.
So to summarize, I think it's the feeling of being accepted and valued by others that comes from your first 100 subscribers. After that, for me at least, things just flew and became the norm.