Should I just stop trying to find a girlfriend? Even with what I did in the past?

I'm 21 and in college, just finished third year of studies. I have no girlfriend, never had one in all years of schooling (Pre-School through now). I have a hard time trying to talk with girls. I shake when I am around any of them. I tried a couple of times in college to find friends, even friends who are girls (I have transferred to three different schools btw). When I was in high school, I got in trouble and was sent to the Dean's office. There were allegations of sexual harrasment from multiple girls that I interacted in conversation with; some thought I was trying to get them to take their clothes off. I never did this, but the Deans believed them and recommended my suspension. One girl tried to get me expelled for Rape accusations (believe it or not, that girl who was two years younger than me graduated Validictorian from the school). But I never touched these girls nor said inapproproate comments towards them. I never even touched the one who accused me of rape. I was just a little too close to them, asked them questions about stuff I should not have i.e. boyfriends, where they live, what streets they're on, etc. I was so stupid at the time, I should have just stayed away. I wanted to interact with them, but now I realize it is horrible. I am still kicking myself for it, even three years after I graduated. Even in college now, I have vowed to stay away from all girls for fear they could send me to the Dean's or President's office. I have tried to talk to girls while in classes, but they do not talk to me, instead they just spend all of their time on texting devices/Facebook/Twitter. I also have this strange fear they are going to put my name all over Facebook or Twitter if I come anywhere near them. I had a really bad experience in high school, that's what I am saying. Its affected me in college, because every time a girl goes near me, its like flashbacks from high school. I just feel like I should stop trying to make friends (especially with girls). I feel like I might as well put myself on a lifetime ban from all girls in years to come. No dating, No marriage, no nothing. I feel like whats the use, I'll get the same answer from everyone all the time. What I am asking is should I stop trying to find a girlfriend in college? Should I just stop trying to find friends all together because of what I did in high school/ just give up looking? My life has been hell since the end of high school because of all that happened. I keep fearing the Dean's or Prez will pull me in or have the police send me to jail or prison because of my interactions with girls.