Is my feelings valid or am I wrong?

I feel really sad and very upset. Me and my boyfriend now have a 9 month old baby and because of his teenage daughter who doesn’t like me which she leaves in June but still we basically can’t live with each other until then because she’ll be unhappy with me. So when I leave and have our baby with me I get really depressed and upset with him because nobody should have to have a child they didn’t make on their own by themselves. I don’t tell him I’m upset I just don’t talk to to him as much when I’m not there.
Is my feelings valid or am I wrong?
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