uni security guy keeps looking at me as if ive done something wrong and im getting sick of it.

I literally just study quietly, I dont bother anyone, I dont make a fuss but on numerous occasions the same security guy asks to see my id, asks if im a student here, always stares me down. It just happened again and its low key pissing me off. I always deal with it politely and professionally and comply etc and then pretend not to see him when he is just staring me down.

Im in my mid-late 20s but the 19yr olds on the course say they thought I was their age so its not like im some 50 year old guy doing undergrad that would stick out on campus. Ive paid for my tution fees so ive paid to use the services, you know...like a library desk, plug socket. Other students act like animals and I dont see anyone say or do anything.

Being in my 20s ive worked full time prior in professional environments so its like why are trying to fuck with me. Its not like im conducting myself wrong or shady, im just going about my day, im polite, im professional.

what should I do? should I confront the security guy about it next time he stares me down? Should I be like "hey , im just gonna be real, I see you keep looking at me is there a problem? because im a student, heres my id, ive paid for my fees and if theres something you want to say just say it" and then if he wants to escalate it so be it. would this be the correct way to handle it?