Salam,
As you already know, diving into inter-faith groups can be detrimental to faith. When you came online, you probably came across plenty of material disproving Shiasm, this caused your faith to be shaken greatly, you then wished to prove to yourself that what you were born with was the correct belief, you came to forums like this one and began debating. This led to further weakening of the faith as you realized things may not have been the way you were taught, you discovered many things about tahsayyu`'s history, origins and practices. As for regular Islam, you as an average Shia are indoctrinated by default to avoid it, you've heard countless stories that it's all Umayyad propaganda, non Shias are all enemies of Ahlul-Bayt, that you're comitting treason by joining them etc... That left you with what? Neither Shia nor Sunni, add to that anger against God when you foundout you were decieved all your life, your heart became distant from the Qur'an, now you wish to seek comfort in the furthest thing away from Tashayyu` related matters, an entire religion altogether. This is all psychological and acting out of emotion, you're tired and exausted from your spiritual journey, even though you're still not at the end of this journey.
As advised above, leave these debates, stick to the Qur'an, God's Book, it is superior to anything else you can read, seek reliable Tafseer to increase your knowledge. I would recommend just reading every three verses and pondering on them, Tafseer aside, try to think for yourself what God wants to convey, why He used the words He used, how does this affect you as a human being, what's the true core message of this religion.
I use these three English versions together: Sahih International, Arberry & Pickthall.