What should I feel with the Helix Syn inside me? Beginner help!

@therealdeal99 first, welcome to the Aneros World!
The Helix Syn is a great massager and it is quite normal to not feel it for the first few times. Do not worry about it not touching your prostate, it is. Again it is not unusual for newer users to think it is not working. I suggest you give it a chance and stick with it for a few weeks or months. The Progasm is also a great unit but designed for more experienced users. Although your experience in the back door is more human related, give yourself a chance to feel and recognize the feelings the HS gives you. It is a great starter model to embark on your rewiring journey. Good luck and feel free to solicit help on this site; there are several exerienced members eager to help you along.

@therealdeal99 Hello from another newbie!
May be both massagers already are too big tools for you, as you should be on the search for finest sensations. You might fail like someone playing guitar wearing gloves. I failed with nexus g-rider and helix syn, but the tiny eupho syn hit me like a rythm stick and my "cimbals" were / pelvis was vibrating (the funny thing with this expression is, in german there is the same word for cimbals and the pelvis: Becken.) Back to your question, there is nothing you SHOULD feel, only look out for and be aware of new slighter sensations and observe them, let them grow or fade away, relax and let go. I would say, let your prostate find the inserted tool and let it play with it, listen to your prostate, let it take command and let your body go where your prostate tells it, maybe starting by laying down for an hour after inserting and do nothing but breathing, try to lead the breath down to your diaphragm but don't even try to enforce this or anything else.
Good luck on your journey! Whatever it takes, it's worth it.