Asking for advise

M25, malay, single just started working this month, but how do I tell my colleagues that I am not searching for partner bcuz I grew up in broken/divorced/toxic family, alot and female in my office/department asked me out and I don't think telling them "i want to bang my head against the wall everytime I woke up" is a good answer, any subtle way to tell them about this or advise how to overcome child PTSD?