I am the mother of a 7-year-old daughter. I am perfectly healthy and plan on being around to offer my advice, solicited or unsolicited, for a very long time. But as no one knows what the future holds, I here offer the best of what I've learned in my 43 years.
If you're interested in someone romantically, initiate effort to try and see the person. If you initiate and the other person breaks plans or doesn't reciprocate energy in making time to see you, then take that as a clue that he/she is just not that into you. Don't try to convince them otherwise.