Are you noticing a pattern yet? So many of these supposed "prophetic fulfillments" fit just about every human who ever lived. Have you ever had friends who ran away from you? Well, maybe YOU are the messiah!
The true messianic prophecies are much harder to prove -- things like world peace, global knowledge of the one true G-d and so forth -- things Jesus never came close to fulfilling. . .
Most missionaries believe that Jesus was without sin.
If he was -- this psalm is not about Jesus. Line 11 of this psalm says "For my life is spent in grief and my years in sighing; my strength has failed because of my בַּעֲוֹנִ֣י / b'avoni / iniquity, and my bones have decayed."
If Jesus was without sin and thus had no iniquity of his own this psalm does not fit him.
As has been discussed in many of these posts -- line 11 in the Jewish translation is line 12 in Christian versions who either eliminate the first line (or simply do not number it). Line 1 says "To the conductor, a song of David."
Yet again the psalm is written by King David about himself.
David is speaking of his own strength failing due to his limitations -- his iniquities.
The Hebrew word here is בַּעֲוֹנִ֣י -- this is more serious that the word translated as "sin." Sin in the T'nach is the word cheit / חטא and it means a “missing of the mark” -- a mistake -- a person tried to do the right thing and "missed." Sacrifices of kosher domestic animals (usually specific animals) could atone for these "I tried to do the right thing but missed" mistakes.
An avon / עוון is more serious than "sin."
An avon / עוון is an impulsive, lustful act -- a person couldn't control their urges. An avon/ עוון (unless it falls under the אָשָׁם תָּלוּי / asham talui or or אָשָׁם גְּזֵל֣וֹת / asham g'zelot) cannot be rectified with a qorban (sacrifice). So what are these two sacrifices which can be brought for an avon/ עוון? They are discussed in Vayikra / Leviticus chapter 5.
Those were the only two types of Avon / עוון (translated by Christians as iniquity) which a person could bring a sacrifice for (an asham / guilt sacrifice). Any other type of Avon / עוון must be atoned for with other actions including charity, prayer, repentance.
So David is saying he was guilty of something worse than just sin (a mistake, I tried to do the right thing and missed). He is admitting to a more serious wrongdoing.
Again -- do missionaries want to admit that Jesus might have committed a lustful, impulsive act worse than a sin?
If not, then wipe T'hillim / Psalm 31 off of your list of "prophecies" about Jesus.
The list maker has taken line 12 (11 in Christian versions) and tried to reference it ignoring the previous line which speaks of the sins of the person in the psalm. Line 12 says "From all my tormentors I have become a reproach-and very much so to my neighbors-and fright to my acquaintances; those who see me outside avoid me."
Mark 14:15 says "Then everyone deserted him and fled."
Again -- is this unique to Jesus? Is he the only person who ever was deserted by friends?
Not even close -- just think of someone who robs a store and is caught by the police. Do his co-conspirators then come forward and get jailed along with him? Usually the person is left to rot all alone. . . this is not uncommon at all. . .
Missionaries love to take very common experiences and apply them as "prophecies" about Jesus when they are pretty universal -- and as pointed out, if line 11 does not apply to Jesus why should a missionary be able to claim that line 12 does? Christians who believe that Jesus was without sin are hypocrites if they claim that Jesus fulfilled this “prophecy”.