Why are they leaving out the CEV?
It's hard, isn't it?
The third primary was only for the subset of the CEV who are severely immune suppressed and for whom it's quite likely they have only a weak response to the vaccine or no response at all. It was to maximise the chances of there being a response (especially if you had AZ first time round and then had an mRNA shot). For some, the response might still be inadequate, but the hope is that the extra shot will mean at least some of them get the intended level of protection.
If the condition that led to you being CEV does nitneffect your immune system, then the jabs should work fir you on the normal schedule