Simon: You really have no choice:
Once you've seen the wizard is just a guy behind a curtain ... you cannot believe in the Wizard again.
You certainly can't sacrifice your life and future (college / university etc...) because of some old guy.
Simon is correct, particularly because of your comment:
....staying is having horrible effects on me. Especially in terms of people of the opposite sex. I just feel lonely, man.
Welcome to the forum. You are so young. At that young age, everything seems to take forever. Of course you have to move on soon and of course you want to pursue the opposite sex. DO NOT HOOK UP WITH A JW!!!!!! DO NOT HOOK UP WITH A JW!!!!!
I don't think you are totally belittling yourself to say you "...have a very specific/unordinary life." You just mean that describing it might reveal who you are to some other lurker from your circle of people. But to be sure, you are not unordinary. You are extraordinary- you realized that WTS is not the truth and you enrolled in college from a group of people that does not encourage such a thing; from a family that even hindered your ability to go to college. That is awesome. You can have a real life ahead of you because of your extraordinary path. But remember: DO NOT HOOK UP WITH A JW!!!!!!
As far as getting out, you are considering the DA path. I won't try too hard to talk you out of that, but consider the idea of just doing what you would do after you DA, then doing it anyway without giving any official notice. It's a type of instant fade. It doesn't guarantee that the elders would not pursue you to kick you out, but sometimes you get away without losing your "inactive" status, which allows family to decide if they don't want to shun you. Just a thought. You wouldn't have to "live a lie." You would simply attempt to be honest with your family, but not always in their faces about what's wrong with JW's.
If you do lose contact with family and friends (most people lose their JW friends and family contact changes), you can develop a new type of family bond with other former JW's and with a new circle of friends and people from your field of work. I have awesome former JW friends and a great relationship with coworkers. I also have family that were never JW's.
It sounds noble to "inspire many to go to college as well, instead of fleeing from it" but are you maybe just thinking like the older JW's? You might be thinking they need to see you active in a congregation after getting college, but really- young people just need to know of your success in life outside of the congregation. They can envy your courage to break away. If you think differently concerning your little brother, well.... you know him. That might mean fading and barely being involved with the JW's for a few more years while helping him. You are so busy with your education that it would be easy to fade back to just occasionally attending meetings. You could talk up college openly and find yourself with less responsibility in the congregation while fading.
Only you can decide if you can do that. Many go one way- staying active (even if barely) for family's sake and many just stop attending and do their best to avoid a DF/DA, and many pull the plug on JW's altogether. The way you write this post, it sounds like you want to either stop attending or barely attend meetings until you finish your education. If you go that route, you can always just pull the plug at anytime later when you are fed up with it.
While it is frowned upon extremely heavily, remind yourself that dating outside the JW's is not a disfellowshipping offense, as long as the elders do not hear of any "fornication." That said, DO NOT HOOK UP WITH A JW!!!!!! So consider that even your normal desires don't have to be ignored and they don't have to lead to being kicked out.