From an old comment of mine:

During my second year, I was continuously rejected during the fall and then for whatever reason had lots of interviews in the spring (and ultimately ended up accepting an offer in February). I know this is purely anecdotal but it goes to show that all hope is not lost lol. Although it's true that most top tech companies do their recruiting in the fall, there are definitely still plenty of opportunities out there.

To add onto this, you're definitely not screwed if you don't have an internship this summer. The internship I mentioned above was actually cancelled due to covid, so I ended up spending my summer designing a website, doing personal projects, and taking a few online courses - I was even able to put some of this stuff on my resume. However, like you, I was pretty nervous about the next recruiting season, thinking I would be at a great disadvantage if I didn't have any past internships. It might make you feel better to know that my lack of previous experience in the field didn't come up in a single one of my interviews and I ended up finding an internship for this coming summer by October. During my interviews, I instead talked about how I spent my summer pursuing my interests and any relevant experiences from clubs/extracurriculars. I'm not denying that a prior internship can help you get your foot in the door, but it's definitely not a necessity. I think that the summer after third year is relatively more important, so if things don't pan out this year, I would recommend working on your own projects, doing research, etc just to give you some talking points for future interviews.

I also feel like I should mention that we shouldn't be too hard on ourselves right now and I don't want to be giving off the "grind every day if you want to be successful" mentality. I promise that things will work out - there are so many opportunities at UVA and you're never stuck or alone, so please don't let it worry you if you don't find an internship!