Stretch Marks

So I have a problem...

I’m 19. I’ve never had children. I weigh about 170-175 and I’m about 5’7”. And I have the worst stretch marks. They cover my thighs, hips, and butt. They are spreading to other areas too. I’m a freshmen in college and I have certainly gained weight because of Covid and starting college but not enough that I can’t wear my jeans or old clothing. My stretch marks are just out of control. I feel embarrassed to be seen in a swim suit. My family is planning a beach trip and I don’t want to go because I am so insecure. Does anyone have any advice?