A lot of people have mixed feelings about insects and spiders and it's nice to see somebody at your age confronting those fears and thinking about them, and sharing them online with others.
Spiders are one kind of arachnid, which are arthropod relatives of insects. Daddy long legs are actually in a different order of arachnids than spiders (not to be confused with cellar spiders which actually are spiders). Scorpions are another kind of arachnid in an entirely different order.
Many of us grow up in a culture of fear for anything with six or eight legs, and our parents squash any curiosity we have about them at an early age like our curiosity is a spider itself. I am glad to see you are thinking about this stuff. Many people go through their lives just killing thoughtlessly on account of their upbringing and out of habit.
The world and the diversity of nature is a beautiful thing if you can learn to appreciate it. We are surrounded by nature's beauty all the time and ugliness is merely a human judgment that is self-defeating.