I can retract my foreskin past the head by about an inch and a half, but I feel like the frenulum might be stopping it from going back any further. Does this mean I have a tight frenulum?

If you're able to retract your foreskin comfortably past the head but feel that the frenulum is stopping further retraction, it is likely that you have a tight frenulum. If it doesn't cause significant discomfort or other issues, it might not need medical intervention. However, if its causing discomfort or interfering with sexual activity, its a good idea to speak to a urologist who can suggest appropriate treatment options, such as stretching exercises or frenuloplasty.