Instead of setting this big goal all at once, “followed a girl from class for talk with her for as the beginning to love affairs” … break it down to just “say Hi so she can start getting to know me”, and take the pressure off.
I don’t think anyone would be so rude as to not speak back when you smile and say hi. It happens, but take the step anyway. I agree with taking it step by step instead of one huge leap.
Start with smiling and nodding, smiling and greeting her, or smiling and asking her how she’s doing. I’m a pretty aloof & standoffish, but it’s because I have a social anxiety. Even when I’m feeling at my worse, if someone smiles and greets me, I instantly warm up and speak to them.
After greeting her take it a step further and get to know her. Ask her out and if you like her, take it from there.
Also, you don’t need to be able to perform a full evocation in order to work with spirits. Try petition spells.