Hi I don't think you're alone.

I believe in the Qur'an but I don't believe it's infallible and the true word of God, not the current version we have on earth. I think the real scripture (Torah, Injeel and Qur'an) are all with God which is what it means when it says in the Qur'an "We will surely preserve the Revelations" but the versions we have on earth are corrupted.
It's nothing but arrogance of Muslims to declare that earlier scriptures have been corrupted but say the Qur'an has not. We're not supposed to make distinction between the messengers so why argue that God Himself did by presrving the later scripture but not the earlier? 'Qur'an-Alone Muslims' or 'Qur'anists' need to be careful not to turn the Qur'an into another idol by considering it to be perfect. I was guilty of that for many years actually.
It's nowhere near perfect. The sura order has been changed messing up the flow. The sura headings and Bismillah appear to be additions. As do Suras 1, 113 and 114 as they are apparently Du'a prayers that were added in. There's significant cross-over between the Qur'an and the Zoroastrian scriptures that needs investigation IMO.
We know that Caliph Uthman created the Qur'an as we know it, changing the order and destroying what didn't fit with his version. Since he was murdered I think that's a sign from God that He was angry with that. I think the original Qur'an as memorised by Muhammad will never be known again unfortunately.
I study the Old Testament inc. the Psalms and the Qur'an (never the New Testament which is mostly pro-Roman propaganda IMO) and try and work out from them what God wants us to understand; plus whatever I can get from trying to be aware of God to try and work out how God wants us to live.
I would call myself a Monotheist not a Muslim. Islam is a way of life that is mostly idol worship IMO. It doesn't describe me. I still like talking and debating with Muslims, Qur'an-Alone or Regular, from time to time (although traditionalists tire my patience pretty quick).

Maybe you could adopt a similar path?