I can guess that my IQ has three digits. It's just that it doesn't enable me to do things better than others. Except solving iq tests, I guess.
It seems that you have a decent IQ. Additionally you seem to be conscious and can avoid procrastination which is a very, very valuable characteristic.
On the other hand you have issues with self esteem. As far as I understand IQ testing gets used by real psychologists in cases like this.
Taking David Burns CBT book, "The Feeling Good Handbook" and doing the exercises every day for 15 minutes would likely do a lot for you, especially if you can get yourself to do the exercises regularly.
I also support Nancy's suggestion of Feldenkrais.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.