Why am i so infatuated?

im a 20 year old guy i can't stop thinking about these girls like their is this one girl like she is 16 years old shes kind of cute i always think about her and she live close by me i always see her walking to the bus stop in the morning to go school(high school) because the bus stop is right next to my house and when i leave for school(college) in the morning she always standing there at the bus stop looking at me sometimes she looks down pretending shes texting on her phone. and their is this one girl in school(college) shes like 18 or 19 i always leave my house early in the morning before her cl starts so that i could see her at the parking lot by herself . she always look and smile at me when im around her even outside of school. maybe one day before the semester ends i could have the to talk to her. and last their is this hottie at work shes like 22-25 years old and she always flirting with me and always calling me names like baby,hon,cutie,etc. and everybody at work is always making fun at me that im his girlfriend(one day maybe) I always become extremely jealous when other older guys touch/talk/flirt around with her especially when she enjoys it. so am i infatuated or something else?