Walaikum Asalam Tammy,

Objectively speaking, we cannot be 100% sure. But as Muslims, we make seeking guidance a priority in our lives. We do it multiple times a day when we say al-Fatiha (The opening chapter of the Quran) during prayer:

{You alone do we worship, and You alone do we ask for help. Guide us on the straight path, the path of those who have received your grace; not the path of those who have brought down wrath, nor of those who wander astray.} (Quran 1:5-7)

The Prophet told us: “[…] Verily the Israelites were divided into 72 sections, but my people will be divided into 73 sections, all of them will be in the fire except one.” The companions asked, ‘Who are they O Messenger of Allah,’ Holy Prophet (peace be upon him) said, “They are those who will be like me and my companions.” (Narrated in Tirmidhi)

So, with this advice from the messenger in the pursuit of the correct path, we can strive to understand Islam as the Prophet (PBUH) taught it and as his companions understood it. And we can ask Allah (SWT) for guidance and keep our hearts open to it.

But we must keep in mind that we don’t try to make what we want to be guidance, guidance. That’s called confirmation bias. We accept Allah’s guidance even if it is not what we think we want. Allah tells us if we are truly sincere in our journey to Him, He will certainly guide us.

{And whoever believes in Allah – He will guide his heart.} (Quran 64:11) so we can trust in Allah’s promise.

So, follow the best of example that Allah sent to humankind-the Prophet Muhammad (PBUH); ask Allah (SWT) to guide you; keep your heart open; and trust in Him and you will be fine, inshaAllah.
May Allah guide us all to His truth. I hope this helps.

Walaikum Asalam.