Need business advice

Im 20 yr old college student that’s studying business and I’m stressed tf out. I started my online business(fashion boutique) this past summer and my first release was really successful. It was awesome. Now I’m about to release my second collection and I feel I’ve run into an issue. I’m super new to this so i can’t say I’m an expert when it comes to merchandising(fashion buying). I have a feeling that my collection won’t do well this time because of my clothing choices.. I’m trying not to be hard on myself but I’m terrified of flopping. I’m funding myself for the business, I’m in school full time, work just about full time, and I’m doing everything myself for my business... i am STRESSED and nervous. I’m doing a lot at once and i just don’t want to be a failure. Everything goes on my social media and I’m embarrassed that i might do well. Any advice from any other entrepreneurs? I’m actually trying really hard lol...