Honestly, when a woman likes you she won't care about your weight. There is someone for everyone and if she is going to judge you for 25 lbs than she isn't worth your time. Just try not to allow your perception of your weight to impact your ability to enjoy life and meet new people.
As a thin guy I have noticed heavier girls trying to get in touch with me online, and these same girls claim guys want "supermodels" and bash skinny girls. So something girls claim that guys do tends to also be the same thing girls are doing.
As for getting a girlfriend, it's going to depend on her ideals and what she wants out of a relationships. I have seen plenty of guys going out with heavier girls and many girls going out with heavier guys. Some look polar opposite of each other. What I do notice also is that if a girl notices a guy is clearly making an effort to get in shape through his actions (like she asks what you're doing and you say going for a jog) she'll be much more likely to be attracted to you.
One huge point I should make is to just keep optimistic and never seem bitter of the opposite gender. I think it kills a lot of the attraction because every accusation a person makes about someone's gender has a chance to be thought of like "Well... I'm a girl, are you saying that about me too?"
not overweight or anything, but from what i've observed, your physical appearance does not make getting a girl impossible and i don't mean your only options are overweight or ugly girls, i mean you can actually win over a decent/beautiful girl if you know how to handle yourself, its all about your personality and how much confidence you give off.