Trust me, when it comes to sex, it really isn't going to matter, but I can see that it could be awkward/uncomfortable at other times. The only thing I can suggest is instead of using disposable pantyliners, which, let's be honest, don't absorb much and must be expensive if you have to change a lot, look into cloth pads and liners which are often more comfortable, absorbant, and cheaper in the long run as you just wash them with your underwear.
Also, just TALK to your boyfriend about it. If you want this to be a long term relationship (which I assume you do) then you're going to get to know each others bodies pretty well and its much easier and much less stressful in the long run to be fairly open early on. I really doubt he'll mind, you'll be less stressed which may help a little, and let's be honest, if your partner has a problem with your natural bodily processes which you have no direct control over, is that really someone you want to be with long term?