not sure if i have ocd but some things r really botheirng me

i have this terrible urge to run my fingernails down the wall and i cant rest until ive done it (and sometimes i dont even then) and when im nt doing it i cant stop thinkinh about it
i have had other obsessive experiecnes like thinking someone is looking at me thru my window while rationally ik theyre not (beign jumpy and having panic attacks)
i also do this thing in my head where i pick up on random words and kinda assess whether theyre odd or even by assigning each letter lefet or right using parts of my body or just in my head. ive been doing this for years and it was terrible when i started but its kinda second nature now and doesnt really bother me