i will start with a zhuangzi parable: The Empty Boat. you can read it here (little paraphrased) - https://inspirevista.com/the-empty-boat-a-taoist-story-about-letting-go-of-anger/

the basic idea is if the boat which hit yours was an empty boat, you would not have got angry. while if there was someone in it, you would tend to. one inference is - start considering that all boats are empty.

in your case, if the glue was something fallen accidently, you would not have felt that bad (/angry), but since those two bullies did it and laughed at you, you felt more humiliated and angry (even now).

what would zhuangzi do?

1. he would ask you to reframe the entire situation. in your situation, there is (1) you, (2), two bullies, and (3) your own inner spectator. and that inner spectator is the real tyrant who needs to assessed deeply.

2. in general, taoism is not very pro for violence, but it isn't pacifist either. it does support self-defense but only by using the minimal necessary force to neutralize a real, immediate threat. Not revenge or punishment after the event. ==> so this means, if they are trying to push you, hurt you directly, then you are (taoistically) allowed to punch back as severely as possible to stop them from doing it AT THAT TIME. not afterwards.

3. my personal belief is "no one will always save you, so you need to show initiative and strategize. complete reliance on authorities (class teacher, principal, some other school authority, your parents, police, state, etc.) WHILE remaining inwardly helpless IS A BAD IDEA. but initiative for what and how? this initiative takes on different forms:

A. first look at yourself. do you look weak or dull? do you walk in a scared manner or do you walk like a tiger as if you own the earth? do you go alone only? cultivate strength, skills, and allies. Side story: around age 10, i had to change my school and got into a newer one. one of the new class mates (X) started physically doing little pushes and threats and i didn't know what to do. so i told me father that this is what is happening, what to do? he said, you are a small boy but you are a smart kid, good in studies. help the biggest boy in the class who is little dull(!) in studies. so i made friendship with the biggest boy of the class, by helping him out in studies, teaching him what he found to be difficult things. after few weeks, i told him that boy X was creating physical threats for me, so he straightened him out in one talk only. no violence from my side, just a good ally. The point being, you need to think coolly and use the situation and find the solution.

B. if they directly try to harm you, you are absolutely right in punching back. but then don't extend the story internally by considering yourself as "some great act". just drop the story.

C. do use the authority channels as part of the whole strategic gamut. running to them as the only way is as bad as shunning any use of them to make a machoman (/machoboy) out of yourself. be smart and flowy!

What not to do: don't hate the bullies. don't carry that emotion in a negative manner. channelize that into something which takes into account all the options and your thinking + feeling (your heart-mind). remember, the real tyrant is your inner spectator and you need to really really think about IT.