Truly you will know or discover this truth by engaging and interacting with your twin flame and within yourself. You will discover some of these characteristics I list below in your dynamic with your twin flame:
(As someone who has gathered what I like to call objective data in my line of profession and love psychic readings that I conduct on the topics of twin flames, soulmates and kindred spirits, I will tell you honestly…. you will sense it. Of course… if a psychic mentioned to you and gave you details about your twin flame and the timing of the introduction or you yourself had visions, dreams and interesting inner knowings about your introduction to your twin flame …and the introduction happened close to or exactly as envisioned or predicted..then these are other ways to gain insight or awareness. ULTIMATELY though the confirmation that you are with your twin flame will come from WITHIN YOU.)
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Excerpt from my post on 3 Key Differences: Your Soulmate and Twin Flame
1. The Connections Feel Different:
With your twin flame you are going to feel light and less anxious about LIFE (yes LIFE!) (and not just about love and your relationship with your twin flame). You will feel less strained and pressured. You are going to feel more ambitious and excited about looking at life straight in the eyes when you blessed with a twin flame relationship. You will feel supported, empowered and more confident during challenging times. Though hiccups crop up throughout the relationship, the connection with your twin flame also typically remains stable. The connection with your twin flame will also make you feel as if your twin flame is fully "permeable". You will feel as if you have 'merged' with your twin flame and your twin flame is very open and allowing of this merge. To a great extent you will feel like a "power couple". (As a side note, you do not need to be part of a celebrity or famous couple to be a "power couple". You and your partner can be a true "power couple" in your own world or realities.) The connection with your twin flame will feel lighter and essentially 'wholesome' even after the relationship traverses testy times. The connection with your twin flame truly feels 'GRAND' and the relationship is to be cherished.
2. How You Approach Testy Times is Different
When you are in a relationship with your twin flame, there is an ease you feel with saying "sorry" to the other person during challenging or testy times. You are also more prone to respond to your twin flame with less ego and more peace and calm than you would be with a love soulmate. You and your twin flame are also able to relatively easily 'see the bigger picture' and understand the importance of your partnership and the value of being together and staying together.