I need some advice.

[iyenal]

Unfortunately I don't have time to give you a developed reply, sorry but I just would like to say this:

But I am worried that I won't ever be able to find someone else to collaborate with

you will absolutely find someone to work with, hell, maybe even here on tVGR. I wouldn't worry about it.

Personally, I wouldn't rely on anyone else. If you can't do something, learn it; I think that will bring you less hassle. But I am not sure if that's better globally, just my personal opinion.

And never work on something you don't like, neither work with someone you don't like.
As it is likely to break a day. Especially when you work with someone you don't feel convenient to work with, because even if today it is not a so bad situation, when you will be in a bad one then if there's no close collaboration and communication you will find yourself in a deadlock, and you will regret to not have acted before.