I need advice

Some background information that may be relevant: my boyfriend and i have been together for almost 5years. We are both 21. We have been living together for 3 years.

So my boyfriend and I rarely have sex, maybe once every week or two, because he says he’s to tried from work. He’s also not been very affectionate for awhile now, like he doesn’t tell me i look hot anymore, he dosnt want to help plan dates or anything (he says it’s bc there’s never anywhere to go where we live). We had a talk about it the other week and he said he work hi of start being more affectionate but i haven’t noticed a change at all. I also should mention by sister recently just figured out she was pregnant, and while im so happy fir her and so excited im also sad and jealous of her because my boyfriend knows ive wanted to try to have a baby for probably a year now but he says we need to wait a few more years, which makes sense but i just want to be a mom and have a family so bad and im so scared im infertile. well when i told my boyfriend about my sister getting pregnant, he said that he was going to start using condoms or we were going to stop having sex bc he was scared i would try to get him not to pull out and started talking about how my sisters life was over and how it terrible it would be to have a kid rn. Idk what to do, idk if i’m just overly emotional or if my boyfriend is losing feelings for me, or if im just boring to him now or what is going on. i just need some advice on what to do. i feel so alone sometimes and i just don’t know what to do.