Have you seen a doctor or dermatologist about this? They would have the best advice for you. I don’t know much about skin problems, unfortunately.
Other than that… please don’t worry about this. Honestly, when sex does finally happen, there won’t be any scrutinizing involved. Your bedfellow will be so thrilled to be having sex with you that (s)he won’t even notice. If (s)he does notice, they won’t care. Trust me, when sex is imminent, there are very few things that could deter an enthusiastic young adult from proceeding.
And if someone ever does reject you or even just comment on your bumps (unlikely), you know what you do? You disengage, stop touching them, get away from them. Because they’re not worth having sex with. Good sexual partners are always body-positive; there’s no point in wasting your time on anything less.