I can really relate to your story! I am 26 now and have dealt with a lot of emotional and self esteem problems and I also don't have any close friends. At 24, I also had an amazing boyfriend I was terrified of losing because I wasn't good enough... But I loved him and I trusted him and he stuck by me through everything. We got married last year and now I wake up everyday next to my best friend and biggest supporter.
Weight loss is the hardest thing I've ever done and I've yet to really succeed. I do have a few simple peices of advice (pretty much things I wish I would have done differently, lol)
Don't let one bad day or even a bad week throw you off plan for good, tomorrow is always a new day. Don't give up just because the journey is too long - that time will pass no matter what, and if you don't improve, you'll come out on the other end as the exact same person. Lastly, keep posting here! When I do badly, I leave and that's a terrible mistake. 3FC is filled with smart and wonderful friends who are always there to keep you motivated. It's really priceless.
Best of luck hun, you really can do it!!
And I hope things work out with that amazing boyfriend; they can be hard to find and you deserve someone who loves you for exactly who you are!