I didn't think I would actually get the job and now idk what to do

I'm in school to be a teacher. Just finished up my associates and now I'm on to my bachelor's. I work at a server. I don't make a whole but I stick it out. Especially since we are severely understaffed. On indeed there was this education company looking for an art teacher in my area. It said associate's degree required, but bachelor's preferred. Honestly when I applied I didn't think I would get it. I figured an actual teacher with a bachelor's and teaching certificate would come by. But they asked me for an interview and just now offered me the position. It's SUPER part time. Only two days a week and one day is for 7 hours and the other is for 5. But it's $20 an hour and I would basically be bringing in the same amount I make as a server but for a lot less hours. My restaurant is pretty understaffed and I really didn't think I would get the job and now I feel guilty if i take it.