There's no one answer to this question since everyone experiences horniness differently and what might seemhorny to one person may not be as arousing to another. However, in general, people tend to get horny when they feel a strong physical or emotional attraction to someone. This can manifest itself in different ways, but some common examples include thinking about sex frequently, fantasizing about sexual encounters with specific people, feeling sexually aroused when touching or being touched by others, and wanting to engage in sexual activity more often than usual.
Of course, there's no need to feel ashamed or embarrassed about feeling horny - it's a perfectly natural human emotion! If you're looking for ways to satisfy your horniness, there are plenty of options available. You could masturbate on your own or with a partner, engage in sexual activities like oral sex or intercourse (with either a partner or multiple partners), watch pornography or read erotic stories, experiment with new sexual positions or fantasies, use sex toys... the list goes on! Ultimately, it's up to you to figure out what gets you hot and bothered - so go ahead and explore your sexuality however you see fit.