Speak to your priest. I too have this issue, though it used to be much worse. I did my baptism/confirmation at the Easter Vigil but I wish I had inquired about other options so I had a better memory of being received into the Church. I’m not sure of what rules must be followed but if you are only receiving confirmation I have seen this many times at regular Sunday masses and even once at a daily mass. You deserve to enjoy that moment.
As far as mass goes you should not be forced to sit in a particular spot. Find a place where you are comfortable. For me that was on the outskirts of the church, more to the back, close to the end of a pew - so that way if I felt I needed to leave I could do so discretely. You may be different, that’s ok, just find what works.
Another suggestion is daily mass or Eucharistic Adoration if you can. I’m not sure why but I do think this helped me become a lot more comfortable with the mass. Admittedly, there was a time I would go to daily mass/adoration several times a week but not always Sunday mass - of course I won’t suggest missing Sunday mass to you since we know we should attend then, but I also won’t lie about what I did or that I noticed improvement. It’s a more intimate setting - less people, less noise, less distractions. In my opinion, it’s a much easier way to acclimate. Just, like I said, please keep attending on Sundays, especially once becoming Catholic.
As already suggested, seeing a therapist to work through this with is also a good idea. I tried about 3 and am sad to say none of them were very open to Catholicism (one even tried to talk me into becoming Southern Baptist repeatedly…) but even speaking generically with them about what I felt/what happened helped me with ideas to try to make me more comfortable. If you live in a more heavily populated Catholic area try to find a Catholic therapist. I’ve also gotten great advice from a couple of priests before.
Lastly, I am so sorry we live in a society that makes you feel embarrassed about this. You had no control over this experience. I can’t tell if it’s a recurring one from your post but if it is please find a way to attend mass that
works for you and find people to help you get through this soon so your entry into the Church is a beautiful, joy filled experience for you!
God bless and you will be in my prayers!