I think i have a hydrocele. should i see a general practitioner or a specialist?

Start with your primary care provider for an initial assessment and to ascertain if consultation with a specialist is needed. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines. Wish you good health!

Your choice. Your GP would be able to confirm the issue or order testing to exclude another issue. They would also know who in your town usually handles the problem, which might be a general surgeon or urologist. Much of these simple issues can vary in who treats them by local custom.