Feeling paranoid about working with pathogens in the lab

I'm recently feeling a bit worried about working with certain cultures in the lab. The bacteria in lab aren't diluted or anything they are active pseudomonas aeruginosa, staph aureus, streptococcus pneumoniae and generally pathogenic bacteria. The lab is poorly ventilated too i feel like I'm breathing all of it in and it makes me scared! Also the chemicals used to clean the lab irritate my throat sometimes because they spray so much of it, wondering if anyone else feels scared working with potential pathogens especially ones that can go airborne .. i guess that's what the immune system is for?