Advice? :(

This will be long. I feel stuck. I have been in a relationship with my s/o for over a year now. To be completely honest I felt pressured into it but said yes anyways because I did love him, then a month later he proposed and I said yes. It caught me off guard and I didn't know how to react.... Then I find out he wants kids, which I've become accustomed to but did noooot want them at first. We have very different life goals and I just want to go travel, he is ok with me studying abroad for a month but after that no traveling without him because he wants to go too. But we might have to bring his 7 year old, and that I feel will take a lot away from the things I wanted to do. I put all of this on hold for him and I still feel like he gets tempermental sometimes and he can't help support me (I am in school full time until april). He has a disability and he wants me to help him go to school though after I told him I didn't want to be the only one supporting us if it gets bad (tbh I wouldnt have cared if he could do the same for me?) and to get a job that doesn't affect his disability. I will make $55k/yr once I graduate after being impoverished af my entire life. I got in on scholarship and worry about saving it, and I'll be spending a good amount putting both of us through school (I am going through to finish a BA, i am just in trade school now). It just seems unfair in some ways and I get upset about it. I want him to do his best and I even tried to set him up with a job that had full tuition reimbursment. we have /nothing/ right now and sometimes I go days without eating and I might be preg (14 days late on period) but cannot afford an abortion if I am. It just stresses me out because I feel like I'm trying to give everything I have without getting a lot back.