I'm hoping that if I tell myself not to fall in love, something inside me will understand.

Falling in love with someone is not something that can just be turned on or off like a light switch on a wall. It is very difficult to try to stop falling for someone, and you must first examine why you feel like you shouldn't just let yourself fall for this person. Is it because someone such as a friend or family member wouldn't approve of, or is it because you have legitimate personal reasons such as not enough time to devote to loving someone else.

Whatever the case may be choose accordingly and wisely, you don't want to live the rest of your life wondering what may have been, but you also don't want to live the rest of your life thinking it may have been a mistake to let yourself fall for someone and start a relationship when you weren't necessarily ready. Examine the situation carefully and make decisions based on your heart and mind.