How do i get my money back?

So im from north(t1 city as well). I came here 4 months back for college and it was like anyone would pay when we're in a group and then others would pay him later. So, one day a guy saw how much i get monthly(it's not much in general but yea alot for me as well cause not only my dad but other people give me too). After that, except for a few guys, others don't pay me back. They'd say they'll pay back after class or whatever but they never do. And idk about you guys but i don't forget a single peny of mine. So i calculated and it's 1k+ now in 4 months from some tea, samosa anol. Now, i have to refuse going with em or else i have to be like you guys pay I'll pay back after getting back. i have never failed to pay them back. If i forget sometimes then i add a sorry note. so please help your boy out. I don't think i can ask for prev ones as it like 15-30 for tea samosa many times adding upto 1000. Also, the same guys would act like I don't return it. When j have made sure to return every penny. Even girls, i also have a gf, so i treat girl n boy the same, even they don't pay back,like wtf.they asked me to pay for their cold coffe and that was a month ago.