What to do ih i have a crush on my professor?

Hello, I would like to ask you a question about topics that you talk about.There is a girl that a like but she is my professor.We make a lot of eye contact, she looks at me very often outside of class, on hallway.Guy and girls around me see that she laught more on my jokes than on others and that a have a special treatment.Not long ago there was a problem and i messaged her on instagram and said her what will happen(she followed me on instagram on other profile that was delated by instagram) and the didnt seen it and about month after that, we met in a bus and we started conversation outside and she said me thanks for that message and said something in way of i could tell anyone because her colleges will be like what are you doing.She needed to go to bank and said me i need to go right, i said ok see you soon bye and wish her marry cristmas and new year, she said thank you you too i smiled waved she smiled and waved me back and said in my language polite bye and i went my way.One we were on the same bus and talked on station and she asked me some questions and wanted to help me to go to the place where i go.Once i got friendly friendly bye like ciao on italian.Also sometimes when she see me on station and we make eye contact she keeps is for about second or second and a half and she makes a stunned or surprised face and looks away.When we talk she is all in conversation she let me sit with her on bus talk and that stuff.When she is messaging on phone i saw only mom, friends and sister.Sometimes she is more on phone sometimes not and i think she is single.But sometimes she just sits in bus and doesnt pay attention to me, just messaging and she once sit on the place behind me also i entered on first doors she entered middle and came back on my side beside all bus was empty.I dont know what to do, i really like her way of thinking, style, she is beautiful and very kind and good person, smart and polite.She is a little rude sometimes in class to guys and girls but never to me like i dont have books, look at telephone and she is ok please put phone away.I played with it on table and it made noise she took it from my hands andi think she smiled that is only time something like that happen.I really dont know what to think, i dont know if she is interested or not, or is she like that because she knows she can get in trouble if she acts on it.She behaves sometimes cold and i dont know if she thinks like me or is just very kind to me.Thank you if you answer😁