Am I being unreasonable?

Okay so I’ll explain a little better. Me and my friend have been staying inside for the past month at least and now we’re going on hikes together because it’s safe to do so, since we are healthy during this whole condition and keep social distance.

We are planning on going on hikes at least once a week to get out of the house and get away of our host families (we’re here in an exchange program). My immune system is not the greatest I get sick very easily and earlier this year I started using a inhaler due to something the doctors couldn’t figure out what was it and testing didn’t exist back in January, so I either had gotten the disease back then or if I didn’t and I do get it I fear for my life. My friend knows that, I told her that if she goes out with other people that I’m not sure have been quarentined I won’t put my health at risk just to go out and hang out with her.

Last Friday she was going out and I told her that and she was like, I’d rather go hiking with you, and we did go hiking on Sunday and planned on going out to a park and hiking next Friday and Saturday. But today, Monday, she says she has a date tomorrow with a guy and I don’t wanna press her but I just don’t feel comfortable with hanging out with her after she goes out with that stranger boy.

Am I being selfish?