May I make a suggestion?
If you’re praying all the time, leading a pro-life group and going to daily Mass, you really need to be going to confession more often than this.
When you slip up and commit an impure act, go to confession at the next opportunity, like that week. Don’t wait around for a couple months.
Frequent confession helps give you grace and make you stronger to fight off the sin. Also, if you’re going to daily Mass and presumably receiving Holy Communion, it’s kind of problematic to be receiving with a lot of unconfessed impure acts on your soul.
Before you call me judgmental, I did all the same things you did when I was in college; only confessed a couple times a year, didn’t mention masturbation or other sexual sins because I was embarrassed and hoped they just got absolved anyway. This was not a great path to go down. For the last 2 years I’ve been going to confession twice a month as well as frequent daily Mass, rosaries etc and it’s helped a lot. I now almost never commit sins that I used to commit a few times a week.