For an interracial marriage with Indian there are both Legal as well Cultural protocols required. Although to learn & follow the Cultural part being a non Indian won't be possible immediately but some back ground of that must be conveyed to you by your Indian boyfriend. You are learning Hindi is a sign of all this. More you meet Indian more you will come to know the multifaceted culture of India.
As far legal part is concerned that I can tell you now itself. Firstly being Non Hindu by religion, I will suggest you to go for Civil form of marriage with an Indian man who mostly are Hindu by religion & usually want the non Indian person to marry them according to their Hindu Rites & Ceremonies, no doubt the Hindu form of marriage is very much colorful but between a Hindu & Non Hindu it is not Legally Valid Marriage unless the Non Hindu Convert & adopt Hindu Religion.
The doubts with regard to the actual conversion to Hindu religion or not will always be a big question so best is to go in for Civil form of marriage by a Marriage Officer not a Hindu priest. For an India to marry in the Civil form there are two Indian legislatures/statutes namely the Special Marriage Act,1954 under which the Indian can marry in the Civil form of marriage in India & the other one is the Foreign Marriage Act,1969 under which the Indian can marry in any foreign country.
Your US government does recognises both these Acts for the purpose of their US citizens who marry Indian citizen under either of these Acts.
Otherwise there in your State in USA there are legislatures with regard to Marriage in the Civil form under which you both can marry.
The Marriage according to the Civil form is not only legally valid in India as well in USA hence there won't be any issue with regard to the validity of the marriage in future.
Hope this point will be kept in mind by you & even if your boyfriend insist of Hindu Religious marriage you tell him to first get married according to Civil form after that he can do any sort of experiments with various form of religious marriages as he wishes to make his parents & other relatives happy.