insercurity & loving myself

Lately I've been acting like an outcast in public I'm only 17 people tell me I've changed since we first started back to school, I call it being "petty" but it's really being messy at one point I was just chill I was getting over a guy I was happy then I got involved with another & he told me I was changing so we stopped talking idk how more to love myself because I'm very insecure & being the person that I'm not and people know that 😩