Yeah us guys get it hard with relationships. We have to try and impress and buy and treat and listen and help and support simply in order to get attention. Girls can do the same just by being attractive. However, life's not fair so just deal with it. Try less casually. Get to know them but in a more flirty way, some girls think you're not interested because you don't "seem" interested when talking to them, yet when in fact we know you're just trying to get to know them. And girls never ever make the first move, that's your job. So if you're that desperate, go make some first moves xD