Hello Hannah,
Welcome to the R community 


First of all, I would like to say that it does not help much to see a picture of your data. It would be much better if you provided a link to the data set or code to reproduce the data. Also, you say that "your data is wrong". If it actually is, then there is really nothing anybody in this forum could do for you.
Having said that, it seems that you have monthly data and the date column is in a format that you cannot easily manipulate. Here, I reproduce the dates you have in your data set and reformat them.
library(dplyr)
library(purrr)
library(readr)
# Generate data
my_data <-
tibble(
date = paste0(rep(2013:2018, each = 12), sep = ",", toupper(month.abb))
) %>%
bind_cols(rerun(5, sample(1:nrow(.))))
# Transform date column
my_data %>%
mutate(date = parse_date(date, format = "%Y,%b"))
date V1 V2 V3 V4 V5
<date> <int> <int> <int> <int> <int>
1 2013-01-01 33 54 19 24 62
2 2013-02-01 50 16 32 52 68
3 2013-03-01 59 2 59 42 31
4 2013-04-01 48 55 8 22 27
5 2013-05-01 18 51 39 64 51
6 2013-06-01 42 9 67 39 12
7 2013-07-01 64 71 43 53 20
8 2013-08-01 70 44 11 56 2
9 2013-09-01 55 15 71 49 71
10 2013-10-01 14 65 72 31 59
You may not understand the code if you are new to R but now your date column is in the correct format.