My two cents;
Not knowing where you live or where you found these other than a mention of beaches I will give my observations.
The first three from left to right appear to have bulbs of percussion which would indicate they were broken from a larger piece of rock. The other two are harder to say due to what I see as natural ware from water and sand or other rocks. All of them appear to have some natural ware from movement and that could explain the small chipping along the edges.
I personally have two points that I found on the Ohio River banks that were in gravel and sand. They both have no sharp edges and are sorta polished smooth by the motion of the river. Sort of like lapidary rock polishing. The flakes you have appear to be worn to different degrees of polishing,grinding and rolling.
Wish I had a beach full of those...:-)
