Think about it this way. If there really was a proof that Islam is the truth, then everyone in the world would have been muslims by now.
Why are you a muslim? Do you have proof? If you think you have proof, it's likely that someone can refute your proof.
I don't have proof of Islam. Rather, I read the Quran. It didn't have anything that convinced me that Islam is the truth. Rather, when I read the Quran, it just "felt" like the truth. So for me, it's just an inner feeling...but not proof. Am I eligible to be a muslim even though I have no proof? Or will Allah say "I will not accept you as a muslim until you find proof"?
Even though I have no proof, if I keep following that "inner feeling", eventually Islam will start to feel like the truth to me. It will be a sort of "self-brainwash". It's how the mind works. If I keep telling myself that it's the truth, my heart will open up to it.
But nevertheless, why are you a muslim? I'm pretty sure you don't have any actual proof. If you're smart, then you should know that no religion can be proven. And since Allah is the all-knowing, I'm sure He knows this as well. So I believe that Allah does not expect you to find proof. If you just read the basics of Islam and feel like it could be the truth, this should be enough to be a muslim. Proof is not always easy to find. Why would Allah make you go through such a burden?