Yep, you're right, excess protein does get converted into glucose. The two solutions are to reduce your portion size, or to take insulin for it. About half of the protein you eat gets converted into glucose, but it happens slower than carb->glucose conversion. Around two hours after eating, the protein will be converted. So two hours after eating is the best time to bolus for it.
If your interested, this info is given in Gary Scheiner's Think Like a Pancreas book. Very much worth buying if you take insulin.