Not a low everything, we are an accumulation of our experiences (both good and bad), what you choose to do with that is up to you. If you are able to recognize your shortcomings you're already better off than 90% of people.
Everyone has their shortcomings, confidence isn't an ignorance of those shortcomings (that's ego) it's joyful acceptance of them in a persistent manner.
I'm not an intelligent person by any means but I am a persistent one. I failed Spanish twice in high school but persisted and got it the third time with a C, in college I failed pre-calc, differential equations, and linear algebra all at least once but continued and eventually passed. For my first Internship I applied to over 180 different companies, only three gave me interviews, the last of which gave me an offer. The first 9 women I asked out said no, after that it got to be around a 50-50 shot as to whether they'd say yes.
Even if you fail at doing the same thing 99% of the time, if you try enough you can get your desired outcome. The thing about failing is that the better you are at it, and the more you do it, the quicker you'll find a way out.
If you legitimately believe that a "low IQ" is holding you back, you are wrong. You can blame the world or people around you all you want, and it might even be true, but at the end of the day the only person out there to improve your circumstances is yourself.