Oh I have seen SO many people say what you say, "I cannot afford an attorney!" I've heard this so many times from divorcing couples. And a few times, including in my own situation, with overcontrolling parents.
This is crazy when here you are dealing with a large source of your current and future income and issues that will affect your life for a long time to come, and you have basically rolled over and let your mother tell you what for all these years. And now you're worried about whether she's going to send the police to your door to take away something they bought for you years ago with this trust money? Oh come on! How much do you think an attorney would cost, anyhow?
As long as you dodge it and try to manage it from advice forums and hearsay stuff and what people tell you and what you've heard in the past... you're still a child and still letting your mother control you. If it were as she says, and you were only to get as much as she dictates, she'd be delighted to let you see the trust papers to prove what she's telling you!
Part of becoming a responsible adult is hiring your own legal representation and dealing with your controlling mother as a peer, not as a cringing child. Dealing with this issue in an adult manner may even improve your relationship with your mother, as she may learn you are no longer a child to be bullied and lied to. "It's not in language YOU could understand" is plain old insulting verbally abusive meanly intended garbage. usually the type of behavior that indicates Mom is running scared and is trying to bark enough to warn you off something she really doesn't want you to find out. If you become romantically involved with someone, I hope the first thing they insist on is that you drag yourself to an attorney and get it established exactly what you do and do not have in this trust and what it says.