Will weight lifting as a woman make me look bulky?

So i’ve began my fitness journey about a week ago and have been going with my brother who insists that if i add light weights into my routine then i’ll end up “bulky” which i don’t personally want since im on a weight loss journey and simply want a slim body, now i think it’s stupid since i know i won’t turn into a body builder if i touch a dumbbell but he’s got into my head, any thoughts?