Emotional Control Help

I’m 14 and I’m either happy or angry there’s no in between. One second I’m having a good time and the next I’m screaming and crying. I’ve never been taught how to deal with my emotions and I don’t know what to do. I don’t really have anyone I can talk to because my relationship with my parents have never been the best and they’re often on the end of the yelling. I just want to find a way to help this it’s been going job for years and I’m physically and emotionally drained constantly and am at the point where I feel trapped.