you have no one to blame but yourself. Take control of your life.
Steps:
1. Get fit- cut off your fat with some cardio and start lifting 3 days with squats deadlifitng and benching
2. Take better care of yourself- get a good haircut, some nice clothes, whiten your teeth, make sure you don't smell like ****
3. Get some confidence- you obviously don't have this or you would've been laid by now. Start thinking like you are great and start doing things that a great person would do. If you keep doing this and actually accomplishing things, you will eventually be confident
4. Learn to talk to girls- i'm no expert at this by any stretch, but there are a few basic things you need to: Be confident when you talk, never come off as needy (act like you always have stuff to do), and develop a personality so people will actually want to talk to you (can't help you here, your personality should shine through as you gain more confidence).
5. Start putting yourself out there. Get out of your comfort zone. You've been in a comfort zone for all of college. Talk to 4 girls a day. That is your goal. Do your best everyday to meet that goal. It will be hard and awkward at first, but you will get better. Don't let rejections get you down.
Honestly, i don't know why i typed this out for you. If i was to bet, i'd say you're just going to ignore all of this and be forever alone until you finally marry some whale. Prove me wrong.