If she is on my mind all the time, what does that mean?

Am I infatuated, am I in lust, am I in love, I never felt like this before for anybody, she been on my mind literaly all year. Feeling is so strong its driving me crazy! Dont know what to do! Tiered of feeling this and not noing what it is to act in the appropriate way! It dont help that Im a libra(trying to make up my mind) but I probly took so long shes not interested anyway but still need to know what this feeling is?????