Worried about the future of my long-term relationship

Every relationship is different. You can't let your parents' relationship or your sister's worries dictate your future. There are many great couples who have been together since high school and have lasted over 50 years. And as long as you and your BF are willing to do the work of the relationship then you'll be together.

I have had the exact same experience! My partner & I got together in highschool and now we have been together for 4+ years! I had the exact same fears but I realized that we have been together for so long Bc we are smart! We love eachother, communicate clearly, and we work great as a team! Trusting in yourself n your partner is everything! But I know how hard anxiety n OCD make it to remember that. I still struggle w it.

Don't listen to her, it's your relationship. If you and your bf have good understanding and good communication and if you can both learn from and observe your own behaviors, I'm sure you'll be fine. And by being aware of your behaviors, I don't mean beat yourself up for every little thing. It's ok to make mistakes, I just mean you two need to own up to it when you do make mistakes and calmly discuss any issues if needed.

i’ve been with my boyfriend since i was very young. we were both each others first relationship, first everything really. we’ve been together 4 years now as well, and i think the best way to prevent this is to make sure you each devote time to yourself. it’s so important to maintain a sense of personal identity in a relationship, specifically long term ones.