I don't normally do this, but I see this from time to time, so just so you know:
wary: feeling or showing caution about possible dangers or problems.
leery: cautious or wary due to realistic suspicions
weary: feeling or showing tiredness, especially as a result of excessive exertion or lack of sleep
I'm sorry if this was annoying rather than helpful!
Can't tell if trolling, quipping, or honestly asking...
I feel like some people who don't want friends are often people with low self esteem who have decided their hypothetical future friends will abandon them, or not like them, or whatever, and so they convince themselves that they "don't want that anyway" as a way of protecting themselves from future pain or embarrassment. In those cases, dating aside, the person should work on their self esteem.
If it's not that, one could try casual hookup apps. These rely on a certain amount of work, and there's no guarantee, especially if one lives in a less populated area, but it's possible.
And the third option for someone who doesn't want anything social and just wants sex, is sex work. This is exactly what it can be for! The only trouble is that in most places it's illegal, which pushes it underground, making it both difficult to find and potentially dangerous... but this is the niche it's meant to occupy.
But honestly... at least consider that it may be the first case, and see if you can search your feelings to figure out "why".