Am I low IQ or just normal is this anxiety?

Low IQ, or just overthinking this?

is this an intellectual issue or Anxiety?

what's this?

What's really going on?

I'm 25, I have my CNA since high school. I work on the hospital now and the nurses say I do an amazing job. I've made mistakes like everyone has, but I'm worried I'm intellectually impaired or disabled. Not because the mistakes I've made. I still live at home and struggle with money. I pay rent every month at home have been since I was 17 to help assist my mom with bills. I wouldn't have a car if my mom didn't let me pay it off to her I pay for the expenses on it. I still have miscellaneous things that I have to get figured out on it like breaks, muffler, etc. But I've just been lazy and haven't done it. I work NOC shift so I basically just sleep all the time. 

Anyways, I've had friendships since elementary school but we all have our own lives which makes it difficult to hang out all the time. We usually hang every so often, but I've been going through some depression and figuring out who I am so I've been flakey. Anyways, back to my point. I missed a lot of school during my elementary days, middle and high school education. I had stomach issues which made me miss a lot of school. My mom took me out in 4th grade and tried to homeschool me but it didn't work. So she put me back in. In 1st grade I went half days, because I was so attached to my mom and I'm sure people talked. Maybe not since the kids were so young. I struggled in science and math. I wasn't in with like the kids who had like mild to severe intellectual disabilities. It was normal kids who struggled in class. 

I was in special education 6-12 grade, for certain classes they had a para in and on tests they'd take you in the hall with other students and read the test out loud. I have ADD the attention part, I get distracted easily. Or they'd help assist you for class work if you had questions. But now I'm thinking maybe I'm intellectually disabled? I honestly didn't take high school seriously. I was skipping classes and I just wasn't caring which could've been why I struggled. I really loved English, and did okay in history. I love writing, and typing. I got super excited about typing letters or doing essays in school. Someone said on here that if I was in special education I would have to be intellectually impaired, it was only a few classes and it was with people I knew that were having issues too. I've been worrying about this recently. It scares me to think I'm 25, and I have something that was never brought to my attention? Or is this anxiety? I did a few IQ tests online, I know I shouldn't focus on that. I got so desperate, I did some Mensa test it was Denmark and got 100. I got obsessive doing these tests, and would get upset if I got a low score. I had so much anxiety taking these. I ranged from 88 to 102 with a Mensa one. I did Norway and got 88 but people say it's deflated. I did a I am a word and got 90 IQ. my therapist said in order to pass my CNA I'd have to have an average intellegience but I was talking to a nurse on a subreddit saying that's not necessarily true. My mom said the schools, DR or even the counselor I saw once as a kid said anything about my intellectual issues when my parents were going. I walked and talked on time, I'm just really worried I'm intellectually disabled. Is this something that they would've caught before turning 18? Or turning 25?