>>702922
I agree with >>702770 . Getting someone into fasting by telling them to eat only one meal a day for a week, and cycle into water only fasts for days on end right off the bat like you suggest here >>702707 >>702711 is not a good idea. It's like telling someone who's never run in their life to start out by doing a marathon; or telling someone who's never even black-smithed a simple pocket knife to start out by trying to smith a Zweihander sword for their first project. It's going to more than likely be discouraging at best, and dangerous at worst.
Fasting is indeed good, but OP should speak with his Spiritual Father about this matter, and go at his own pace, rather than try to Saint mode it right out of the gate.
As for directly dealing with the fornication issue, OP, listen to what this anon said here: >>702692 . Make your boundaries clear. If she is not willing to comply, cut her off like a light switch.
>>708889
All sin starts out as temptation.
>>702699
If all your friends have this issue except for you, you might want to find a new group of friends, especially if they encourage or exacerbate such passions. If it's only a few, and they're not having that big of an impact on you, don't give up hope just yet. Honestly, your primary close bros should either be at your church or of a similar mindset. Jesus ate with the sinners, but his tight knit inner circle were the apostles.