I can't resist anymore!?

[Syndrome Turner]

I am 16 years old and gay, an i recently found love. The problem is that my parents know that i am gay and my mom is very suspicious and annoys me. She says things like "Don't hide anything from me" or "I am worried" (she's worried about this). I see that she is very suspicious and I don't like it. I deleted my Facebook, put a password on my phone and always check if I logged out from Messenger on which I talk with my boyfriend when we're not together. Everytime I go out she questions me a lot and I can lie her well. But I feel uncomfortable after she says "I am trusting you. Don't dissapoint me!" and I don't wanna look bad in front of my boyfriend. I ran to the computer once and I logged out of my facebook right in front of her. Of course she suspected something, even though I usually am very patient and natural in front of her, but this was critical. I just don't wanna care about what she says and don't wanna feel bad with my boyfriend. I WANT TO BE MYSELF AND LOVE without anyone caring...
The question is: "How can I make my mom believe and trust me better? What can I tell her?" (i told her that i went to a film with a classmate and i looked very natural and she quite believed...). Tell me something else with what I can comfort her! I need experienced liars...(there's no other way in comforting her. telling her i am gay while she still hopes i can change will hurt her).