You sound like you are still young yet and just trying to figure out how to navigate when it comes to interacting with individuals that you spend time with and try to be friends with. From what you have shared you do try to be there for your friends, however, it sounds like your friends don't know how to be there for you and tend to put you down. Well, some people learn how to be better friends to others and some just never learn and a friend to them is someone they "use". That means these individuals tend to use you to vent to, to put down when they need to feel superior, to just be someone they use when they don't have anyone else to hang with, and expect you to do for them and praise them. Sometimes a person can be more lonely when they spend time with a so called "friend/friends" then they are when they are alone. This is typically a warning sign that the individuals you are calling friends are not really friends and tend to just use you as an audience. This is what creates a codependent type individual who doesn't even realize they tend to be that individual that is just an audience in relationships and is only recognized by others when they don't fit into what these others need FOR THEMSELVES and they tend to be the one a person takes their anger and frustrations out on.

Unfortunately, many children are not nurtured properly where the parents and mentors help them learn to develop their OWN identity and also to encourage others to do the same and show respect for that. Often there is too much focus on what a child doesn't get right instead of what they DO get right. This leads to the development of deep insecure feelings when a child gets something wrong and they don't know what to do about the shame they experience, when instead they should be focusing more on what they ARE doing well and getting right, to focus on the fact that they ARE actually learning and gaining new skills. When your friend was putting you down for your weight, she was showing you WHAT SHE LEARNED which is to focus on negatives instead of saying "you are pretty and a nice person, it's good that you are improving on that with working out at the gym".

Some never grow out of being critical and only using others, and some actually learn how to be a good friend and develop friendships where they enjoy spending time with the other person and don't walk away feeling bad about themselves. It sounds from what you shared that you distanced from these two friends because they tended to encourage you to feel bad about yourself too much. Doesn't really sound like they have changed much, time to find some new friends that you can feel good around instead of constantly feeling bad.