Should I proceed with the marriage if I have second thoughts but my family is happy with it?

Remember this piece of advice: do not go ahead unless you are 100% comfortable. Don't worry if others are comfortable in the situation or others want you to get married. They are not the people who are going to be getting married. Your parents are not the ones who are going to be in the marriage; you will be in the marriage. So you need to be a hundred percent comfortable. Until you're 100% comfortable, then take your time. There's no rush; don't be pressured by others. Make sure you're 100% comfortable before you go ahead.