How do I ensure I'll be able to claim authorship over a math proof, as an amateur math student? I found proof for an open math problem. I know it likely has flaws, but I can't catch any and I'd like to put the proof out for revision. But without losing the credit for it, in case it turns out to be correct.
The thing is I'm just a math student and I have no experience publishing math papers or anything.
I've already checked a post here with the same question I'm asking, in which many people recommended talking first with a mentor or a trustworthy teacher, but I've never had a relationship with a teacher. And currently, I'm not seeing my teachers in person, because I'm in quarantine and my classes are virtual. Moreover, it would be really embarrassing for me to talk about this with people I know, especially if they rapidly find a mistake in the proof. I fear they'd think I'm silly for even considering the possibility I may have proven something no mathematician has been able to prove before. So I don't want to share this with anyone I know unless the proof is reviewed by expert mathematicians and I'm fully sure it's correct or at least seems to be.
Finally, as you may have noticed, English isn't my native language, so I don't know how I could manage to write down this proof in English. I'm not familiar with the math language and notation used in English.
I want an English version because once the proof is published, I'd like to send it to important mathematicians for revision and I don't know important mathematicians who speak my language.
Moreover, it would be really embarrassing to me to talk about this with people I know, especially if they rapidly find a mistake in the proof. I fear they'd think I'm silly for even considering the possibility I may have proven something no mathematician has been able to prove before

My advice for this concern is to propose your work as an attempt rather than conclusive. It is normal and okay for attempts to fail: most do. If you reduce your expectations publicly to those that you hold privately, there is little cost to failure and substantial benefit to success. Ask others to find errors in your work, and be humble.
If they can find no errors, they will be sufficiently impressed. If they do find errors, you can be appreciative and they will feel useful for having found and taught you something and you need not be embarrassed, only thankful.