Recreational / Hobbyist UAS pilot reported flying a UAS without obtaining LAANC authorization. The reporter also reported other UAS were flying in the same airspace.

Narrative

On Day 0 around XA:30; I forgot to get LAANC auto-approval before flight. One hour before flight; I checked the air aware app to ensure there were no TFRs in place; and there wasn't. Before I launched my drone; I mistakenly thought I already submitted a LAANC when I was checking for a TFR but failed to do so. During flight; there were up to 5 drones in the air at the same time. I maintained full visual of my drone the entire flight. During flight; my drone did cross paths with another. It did not appear we were close in altitude. I cannot accurately guess how exactly close it was. Mine and the other operators drone lights were operational. No damage or incident occurred; and no contact was made between drone operators.As a result of this mistake; I've begun further educating myself on drones. I have obtained my TRUST certificate. I'll also be obtaining a part 107 license to help further my education in drone flight; laws and safety. I'll be exercising increased caution when flying alone and near other drones.