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TL;DR: I'm stressed out over choosing a side project because of the commitment and fear of failure :(

I'm a student and summer vacation starts in 3 days (and actually has already started for me, thanks to a "smartly planned" hospital stay), so I'm currently looking for a cool project to start. This will be my third summer vacation during which I want to make complete a project, and I never actually did it. The first year, I couldn't think of any reasonable, doable project which would be interesting and fitting for the time scope (I was quite new to programming back then, so I probably couldn't have done things that would be interesting to me, an any project that I could've done would just take 20 minutes, cause I wouldn't understand anything more complex). The second time, I chose a project too big with too much new things I had to learn on the go. I actually pushed through for nearly a week, but then I realized that I only completed like 25% in that time, so I lost my motivation, thinking I could never finish it, while not wanting to start a complete new project, because that would've felt like wasting the time I put into my first project. It was still a valuable project and I learned a lot by doing it, but this year I want to actually finish a project; so I'm really stressed out right now trying to come up with a good project.
Usually I have millions of vague ideas in my head, but as soon as it comes to choosing, every single one seems to be the wrong one, or I forget about all of them. Everything that kinda interests me seems way to big and complicated to me, but I sometimes feel like I'm just underestimating my abilities, but on the other hand I have ~25 projects on my hard drive, of which 4 or 5 are finished and most will never be finished. :/
And it's just so overwhelming to choose something like that, because on one hand I really want to do a bigger project that I actually finish, and summer vacation is the only time I have so much time to code, and I love coding, but on the other hand choosing such a project that I will work 2-3 weeks on is too much commitment and also I'm anxious about failing it and never finish it, just abandon a buggy mess. Am I the only one to feel that way, or are you too having problems choosing side problems?

And, I guess if you have any ideas for a suitable project (literally anything, so that I might be exposed to some new ideas), just comment it.