Would it sound awkward if I say "Just gonna enjoy myself" instead?

Native speaker’s answer
Rebecca
"Enjoy myself" is a bit different because it usually implies that an activity is being done alone, by oneself. "Have fun" here just implies that she will enjoy whatever she is doing, and does not really mention the company she keeps while doing it. Ex: I'm just going to enjoy the weekend by myself. Ex: I like to have fun by doing things like sports and travelling.