Dog starts to roughhouse every time I try and play with her?

I’ve been trying to teach my dog to play tug more and it’s been working, but I’ve been having the same issue as in the title for awhile. She will run around, tug the toy, but after 3-5 minutes she will start to jump on me or try and bite me instead of the toy. I try and redirect her to it but it only works 50% of the time, and if she does grab the toy she often won’t tug anymore, she only wants to bite me and roughhouse. I don’t dislike it all the time, but I don’t like when she just starts throwing her body at me and biting my arms when I didn’t initiate play like that. I feel like I barely play with her now but it’s because she just bites me so often, it’s not very fun anymore. We get some tugs and she just gives up, jumps at me, I say no, and she doesn’t care about her toys anymore but looks super sad. Any advice or ideas are greatly appreciated.