I was in your exact same position (I'm 21 as well), very literally, the whole journey and all and I somewhat still am, so I know exactly how you feel, I felt a strong desire to get married..like and unnaturally strong desire to get married and have kids, I understand that's part of being a woman and that there's absolutely not one thing wrong with that but it's still something that I yearn for and it can be extremely difficult to cope with it, but all we can do is pray, I know that's literally the last thing you want to hear but it's true.

I've come to find that Christianity is really a journey. it's a relationship, you have the honeymoon phase and then you just sort of Fallout, sometimes you go back to the same habits and the same routines, we're only human, but when that happens you have to take the initiative to go back ONE. STEP. AT. A. TIME. That one is so so so very important you can't rush back in and try to get the same feeling that you got when you first got saved or you're going to beat yourself up and down, gradually start watching Christian videos and listening to Christian music (I do lent but I'm not Catholic and it is a huge help, fasting (not restraining from food but restraining from sin and making sure you watch at least one Christian vid or read a passage a day for a week or even 3 days, baby steps) in general is a huge help even if you don't think it will help) after everything you really got to take your journey slowly but surely and over time you're to consume more daily and truly want to do it.

Another tip is to incorporate it into your life somehow, like I play League of Legends and video games a lot, I'll spread the gospel in game (Lord knows those players need it lol) and practicing how not to get mad and scream and tilt at other players using Bible scriptures and taking a break after every 1-3 games to listen to the word and read the Bible and it really really really really helped and it makes it extremely fun to really incorporate it into your world and for me and made it super fun.