Why am i 'afraid' to test my IQ?

I’m not sure if it’s fear or worrying that stops me from doing an iq-test, but the fact is there…, i won’t (untill now).
One reason i didn’t/don’t do it, is that i already get nervous just thinking of the stress i will feel cos of the time it will take to do one, and the fact that (i heard) some questions are time-limited.
I’m afraid i will error some questions just because of that.
Am i afraid that the results will be low (and i think they ‘should’ be higher), or they will be high(er) then i’ld expect and get nervous of that?
Thanks in advance.