Why do I get angry when girls don't approach me ( friends ) even when I approach them ? Should I ignore them if they don't make me happy ?

I am 21 year old male.I work in an office .I have recently started getting upset when I approach girls but they never approach me to just talk .I am generally a nice guy but recently this has gotten me very angry. Its not like they are busy with work because we all have the same amount of work and not so much that it's impossible for them to come talk to me .This is this about the first girl in my office .She is a nice girl and talks to people but I know that it is only me approaching her first , me saying hi and it's like I have to call her 3-4 times before she comes and talks to me. I have known this girl for almost a year. Same thing with a second girl .I asked her why she doesn't come and talk and she says what's wrong if you come , why so much ego.I told her it's not ego because I also come and talk to her. I am a very nice guy and I feel these girls take me for granted like I need them because I have always approached them. So I don't know what happened but past week Friday I had enough and just stopped talking to these girls . The first girl said hi , how are you and I spoke normally . But i never approached her. She came to me in the afternoon and said " hey how come you didn't come and talk to me " and I said I didn't want to disturb you and then I told her I have a lot of work so she should just go . She said why are you showing this much attitude. She also asked me for a few questions after. The second girl saw me later on but I didn't speak to her properly today.