I have a lot going on and I need advice

I apologize in advance because this is probably way less complicated than I think it is but I feel completely lost. Also, I’m on mobile so the formatting will probably be god awful.

To start, I’m a 18(m) senior in high school, and I’ve developed a crush on a junior girl. We have one class together, and it’s weird because me, her, and another guy are in one class which is like the advanced version of a class we have already took, but it’s lumped with that previous class because there’s only three of us, and because of that we almost always get put together for group activities.

A little bit of background, we are both very introverted and quiet, but during our first group project we really hit it off. I definitely felt like we had something going. That was fine for a while, but we rarely talked outside of group projects.

Fast forward to a couple of weeks ago, my mental health took a nose dive. For whatever reason for the past couple of weeks whenever I go to that class I enter a huge depressive spiral, and break down, four days a week (there’s a day we don’t have that class). I’ve been withdrawing from really good friends who are very worried about me, even though I don’t want to. I could tell she picked up that something was wrong, but she never said anything. It probably doesn’t help that instead of a resting bitch face I have a resting “I kill people” face, which already makes me relatively unapproachable, but it’s made worse when I’m upset. This Thursday has been the only time that I could keep my composer in that class since this started. We had another group project, and the first thing I said to her was apologizing for being distant. She brushed it off and said it was fine, but during the project she seemed a little distant herself. Now I can tell she’s at least a little socially awkward, so am I, but I can’t shake the feeling that I fucked up.

I’m also concerned about whether or not pursuing a relationship is a good idea right now. Don’t get me wrong, I desperately want to be loved in a way that family and friends can’t give me right now. It’s really weird really, I’m surrounded by people who care about me but I’m still plagued by feelings of loneliness and depression. I want to be with her more than anything right now, but I’m terrified of hurting her accidentally. While I feel like my current issues stem from my loneliness, I’m afraid that it won’t stop even if I get a girlfriend and I’ll end up experiencing more social withdrawal and hurt her. She’s one of the sweetest people I’ve ever met and I wouldn’t be able to live with myself if I hurt her.

Again I’m so sorry for the novel, I just needed to vent and try for some advice, and this’ll probably get ignored anyways.

TLDR, I’m scared that I made my crush hate me after withdrawing from severe depression.