Need some advice

So me and my boyfriend have been trying to be sexual and I have a trauma past when it comes to doing so we been working slowly on that and im at the point where I am ready but everytime I freeze up and don’t do anything for him which leads to it not going all the way . Any one have advice as to what I can do ? What can I do to turn him on ? that isn’t the normal bjs and handjobs and role play . Ik it’s a stupid question but I’m stuck at what to do and if anyone has advice on what to do when I start to freeze and my confidence goes way down even when he try’s to help me through that part . Is there anything I can do on my end ?