well I'm glad there is someone
who understands what it was like for me, when I was your age. (I'm sorry it had to be you, of course!) but joking aside...assuming that you are not
planning to become a monk
in the near future, I just can't see why you don't do what most single blokes do if they live alone, with no girlfriend, when the urge becomes intolerable - give 'madame palm and her five lovely handmaidens' a call. No charge, no expense, no worries.
I'm joking about it because you really don't have a serious problem. You are just what is called a 'normal 25 year old man'. Lust is stronger when we are young, and very, very gradually tends to ease a bit with age and experience.
I look at it this way: do what causes the least harm, given the current situation.
For some it would be, date and meet more women and get a girlfriend. For some, masturbate as much as is needed to not go and do something worse (like abandon a promise to oneself by visiting to a massage parlour...) For some (like myself) it is currently, trying to let go of masturbation (but not feeling too much guilt about it if it happens). And yes, for some the meditation on the loathsomness of the body is appropriate, accompanied by strict celibacy (not easy to maintain as a layperson...I've tried it). Whichever one you pick, choose one that is realistic, and that won't drive you nuts. Minimize
harm...we might not be able to eliminate, but we can minimize...
By the way, our mindfulness doesn't have to go out the window (should we decide to) do self-pleasuring. We can always
maintain a measure of sati-sampajanna, even during that particular act...I won't go into details as this is a Buddhist forum, but know
the vedanas as they arise and pass away...witness
your own craving, and see how it also changes over the session...even doing something that isn't strictly speaking very wholesome, we can still learn something, I've found.